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Hi, I'm really curious about this card, which really sounds promising.
Still, I've not found any ultimate combo that truly justify its use. Maybe with Ashenmoor Gouger, for a mass-attack that can't be blocked; with Hero of Bladehold to generate an impressive army or with islandhome creature as Sea Serpent (Dandan is better), to kill all of them if opponent is not using Blue. Also, Nemesis of Reason sounds promising! But I really don't feel to use it with triggered effect creatures, since the opponent would benefit of the same advantage too.
What do you think about?

I had a lot of fun with a deck with plenty of token generators (Spectral Procession, Elspeth Tirel and others) and then a few big finishers for Mirrorweave. The best and funniest were Frost Titan and Ulamog's Crusher.

http://tinypic.com/r/21kjmyw/7

Good idea! I shall give it a try

Shantak, you know your idea was not bad at all But I've found the Frost Titan too slow for my tastes so I've invested more on Hero of Bladehold, Soltari Champion and Thopter Assembly to pump Artisan of Kozilek.
But this deck didn't satisfy me because the Hero of Bladehold is so powerful that it was often enough to win the game.
So I've built another one, with green, since it has the following cards, that are very useful for the combo:
Honden of Seeing Winds
Squirrel Nest, very useful to quickly generate tokens
Honden of Life's Web
Primeval Titan, great to clone & to draw all lands
Timbermaw Larva, great since opponent won't get any benefict
Groundbreaker, great since opponent's creature will be lame on defense
Overwhelming Stampede, for the final blow & to maximize advantage

I also used Frost Titan and Artisan of Kozilek with success. Also I liked to use a little three card combo, as my deck was more control like- I used Time Elemental- it's a good creature and it can do some good stuff. I used Gideon - he is a cool planeswalker with his -2. But a little combo that occured me while creatur mirrorweave deck- if I have time elemental on the table and Gideon on the table, if I use Gideon's +2 and then in upkeep step of opp I copy Time Elemental, my opponent will get one sided WoG and will be hit in his face for some damage.

Time Elemental combo is nice, but a bit slow to happen, because it requires the Ai to have many creatures and you need Gideon, that is nearly a Legendary cards. How many of "him" do you use in your deck?

4 Gideons. Deck had enough draw to not worry about Gideons in hand and with them I could use Gideon as Vengeance + Fog (because opp was focusing on it) without worry. One of the most important things to deck was my own creature base in form of Wall of Omen x 4 and Sea Gate Oracle. And Glimmerpost and Cloudpost as a little mana engine. Also nothing feel so good as attacking with animated Celestial Cannonade with animated Gideon and Oracle and mirroweaving them all into artisans ;p With so much mana floating I also used Rite of Replication which is good card. Its 2UU version essentialy works as Frost titan 5-8 and Artisan 5-8. It kicked version (and I could kick it every game) worked as good as mirrorweave as finisher, as most decks in challenge mode and in my gauntlet don't play wrath effects and point removal is almost never used to fizzle spells ;o

Lol, nice combo. instead, I've preferred other strategies. In fact, I keep a bunch of Expedition Map to search for Gaea's Cradle and Tolarian Academy, which will both be boosted by Nuisance Engine or Thopter Assembly in a couple of rounds. Rather than Rite of Replication, instead, I prefer to use Conqueror's Pledge: very soon my hand will be empty of cards and it will be a perfect time to draw with Slate of Ancestry and then turn all creatures into Artisan of Kozilek: even if, by luck, the opponent should survive, I would have creatures back from graveyard and the AI would have no permanents left.

Anyway, Gideon is strong: I've had a lot of fun with him in a non-competitive Solder/Archer tribe deck! It used those creatures with a similar ability to D'Avenant Archer joint with Orim's Prayer, Norn's Annex and Chastize it was a great "Siren's Call".