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AI runs into Serrated Arrows. I attack with a 3/4, AI blocks with a 4/4 and gets wrecked.

AI attached not one but two Torture to my creature.

AI decided to finish off my 1/1 that was already disabled with Roots when it drew Serrated Arrows, ignoring my scarier stuff.

The AI should maybe not sink the maximum amount of mana into Roterothopter every turn. It seems to have no concept of "spare" mana. Instead it seems to sink all of its mana in the first mana sink it finds, either during upkeep or during combat, and then has no mana left for casting spells in M2 (which is where it seems to prefer casting its spells). It's generally good practice to wait until M2 to cast anything, but if that leads to blowing mana on low priority mana sinks it gets counterproductive.

Known: AI used Soraya the Falconer to give banding to a tapped bird. Three times in a single turn.

AI should maybe not cast Serra Bestiary on turn 2.

AI does not use Broken Visage in time to be able to block with the token.

I cast Retribution targeting the AI's 1/1 Skeleton token (from Drudge Spell) and Ebony Rhino. It chose to put a -1/-1 counter on the 1/1 and sac the 4/5. I got a similar 2-for-1 when targeting Soraya the Falconer and Mesa Falcon.

AI played an artifact creature into Chandler and open mana.

AI played a 2/1 into Anaba Shaman and open mana.

AI activated Dark Maze and then didn't attack with it.

The AI always chooses to play first but not every format is a "play first" format. Hard to say which is which, though.

AI does not tap its Anaba Shaman in response to Roots even though it has open mana. Also does not tap its Reveka, Wizard Savant in response to removal.

AI keeps paying upkeep for Hungry Mist enchanted with Roots.

AI cast Serra Aviary when it had no flyers but I had two.

AI tries to pump its Mesa Falcon out of lethal damage range but does not have enough mana for that.

Knight of the Reliquary.

Its horrendous to see the AI building a 13/13 Knight only to never attack with it as long as there is something on the human side to block it.

With many enchantments that have an option to be played with flash if they will be sacrificed at the end of turn (eg Armor of Thorns) AI will always play it in upkeep instead of main turn (even if it gains absolutely nothing this way except it will live just one turn)

Fog Bank - AI cannot play against it at all. If some creature gets blocked by Fog Bank, AI will for example spend all it's mana to pump it (instead of casting something new) or will waste cards like Giant Growth etc.

AI will cast Viashino Sandstalker even if it has no plan to attack with it.

AI casts Overrun tapping for mana the only 2 creatures on the field.

AI Unearths stuff even after the Attack phase, so they just get exiled and wasted.

I "bubble" the AI's Treetop Village with Kiora, the Crashing Wave's +1 ability. On its turn, the AI animates the Treetop Village and attacks with it.

I +2 Gideon Jura. I have to 9/9s. AI activates its Treetop Village and is forced to feed it to my 9/9s.

AI casts Thoughtseize. I'm holding two lands. AI casts another Thoughtseize.

The following issues are fixed or have been improved by excessum and me:

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Bundy wrote:Computer casts Gorilla War Cry during my turn. I think it just wants to draw an extra card from Gorilla War Cry, but making my creatures harder to block when i have a few big creatures on the battlefield is not a good deal for just one card.

ggwithrow wrote:AI seems to animate its manlands (Mutavault, Mishra's Factory, etc) even if it isn't planning to attack or otherwise use the creature aspect of the card.

ggwithrow wrote:AI casts Tamiyo, the Moon Sage on turn five while my board is Island, Island, Celestial Colonnade (tapped). AI passes the turn without activating Tamiyo to tap one of my lands. Next turn I cast Worn Powerstone, pass. AI once again doesn't activate Tamiyo, the Moon Sage at all and passes.

ggwithrow wrote:AI blocked large creature with non-summoning sick Prodigal Sorcerer. AI did not tap Prodigal Sorcerer to give useful point of damage before dying.

gos wrote:AI evokes Ingot Chewer when there are no artifacts in play. This even happens when it has enough mana to cast it.

tasteful wrote:In another game, opponent played Darigaaz's Caldera first turn.

Pux wrote:The AI will attack into Haunted Plate Mail even if the player can activate the ability.

Agetian wrote:The AI seems to have issues trying to use Antler Skulkin. He'd use its ability on a creature with 1 toughness (a bad target for Persist already), and would waste a bunch of mana using that ability numerous times on the same target. Maybe it's worth adding a check that the potential target doesn't already have Persist, and >1 toughness would be nice too...

mastroego wrote:AI is mana screwed (one Plains on the field) but could use its Weathered Wayfarer to get more lands.
Instead, it uselessly attacks (I have 0-power blockers) over and over again, until I mill it to oblivion several turns later.

Agetian wrote:When I have Web of Inertia in play, the AI is exiling a card even if he doesn't have to (such as when he's not planning to attack anyway, or even when he doesn't have any creatures!)
* Orcish Spy. He is activating this every turn, even at the cost of not being able to chump block a deadly threat. I don't think the AI actually pays attention to what it "sees" yet, but even when/if it does, it lets you look at 3 cards so there's no reason to use it every turn unless the opponent has shuffled.

Xyx wrote:The AI uses Horn of Deafening on its own creature, during its main phase.
The AI used Liliana of the Veil's -2 to make me sac my only creature: Academy Rector.
The AI seems ignorant of Mishra's Factory (or any manland) on defense, and will happily run its 1/1s into them (just like Shandalar).
The AI will chump block Order of Leitbur as if it doesn't see that the Order of Leitbur can be pumped and given first strike.
The AI does not like to chump block with its Rukh Eggs.
The AI really wants to see the top 3 cards of my library with Orcish Spy. It even double-checks if it has two spies.
The AI gives its Order of the Ebon Hand (and Icatian Infantry) first strike before they're even blocked (or blocking).
The AI cast Demonic Torment on my Blazing Effigy.
AI attached not one but two Torture to my creature.

Marek14 wrote:AI is also blind to Jace, Architect of Thought -- it attacks with 1-power creatures into it when its first ability is active.

Pux wrote:The AI shouldn't pay the Oracle of Bones Tribute if it the Oracle was the last card in your hand.

antekm wrote:Fog Bank - AI cannot play against it at all. If some creature gets blocked by Fog Bank, AI will for example spend all it's mana to pump it (instead of casting something new) or will waste cards like Giant Growth etc.

mastroego wrote:AI Unearths stuff even after the Attack phase, so they just get exiled and wasted.

Thanks Bundy, ggwithrow, gos, tasteful, Pux, Agetian, Xyx, Marek14, antekm and mastroego.

The AI doesn't seem to be able to activate the ultimate abilities. A good rule would probably be for the AI to activate it if the planeswalker will have 1 loyalty counter left after activation.

Pux wrote:The AI doesn't seem to be able to activate the ultimate abilities.

Which planeswalker? I've seen plenty of Liliana of the Veil ultimates.

Pux wrote:A good rule would probably be for the AI to activate it if the planeswalker will have 1 loyalty counter left after activation.

Depends on the situation and the planeswalker, but I don't always dare to wait another turn.

AI refuses to chump block my attacker wearing Sword of War and Peace and then dies to the sword's trigger.

Xyx wrote:

Pux wrote:The AI doesn't seem to be able to activate the ultimate abilities.

Which planeswalker? I've seen plenty of Liliana of the Veil ultimates.

Pux wrote:A good rule would probably be for the AI to activate it if the planeswalker will have 1 loyalty counter left after activation.

Depends on the situation and the planeswalker, but I don't always dare to wait another turn.

It was Kiora, the Crashing Wave and Jace, Architect of Thought. I just thought the problem affected all planeswalkers because the two I played against didn't work. I'll test some more walkers and update my post if more don't work.

Edit: Not working are:
Ajani Goldmane
Ajani Vengeant does not target lands with his +1 ability and just sits there if nothing else is in play.
Ajani, Caller of Pride
...and a lot more, probably. I tested with an empty board, so this might be related. But not activating ultimates if the board is empty is stupid