[fixed]Pay No Heed can't prevent damage from source & more

[Aswan jaguar]

Describe the Bug:
1- Pay No Heed can't choose a spell on stack.
2- Pay No Heed can't be cast to choose a source in advance.
3- Pay No Heed prevents damage to creature or player but it shouldn't it is worded differently than Samite Healer and should only prevent damage from source.For instance if someone plays Earthquake you can't prevent damage from Earthquake all together but only damage made to you or to a creature you control.
4- It doesn't prevent damage from a source for the whole turn.

Which card did behave improperly?
Pay No Heed

Which update are you using? (date, name)Which type? (duel, gauntlet, sealed deck)
Manalink 2016/08/27: Eldritch Moon v2, duel

What exactly should be the correct behavior/interaction?
1- Pay No Heed can choose a spell on stack.
2- Pay No Heed can only be cast to choose a source (and if are spells that make player deal damage can choose player as a source, too) in advance.
3- Pay No Heed should only prevent damage from a source.For instance if someone plays Earthquake you can only prevent damage from Earthquake all together not only damage made to you or to a creature you control.
4- It prevents damage from a source for the whole turn.

Also note it doesn't target and prevents damage from that source for whole turn relevant rulings:
Rulings
1/7/2013 Pay No Heed doesn’t target anything. You can choose a source with hexproof, for example. You choose the damage source as Pay No Heed resolves.
1/7/2013 If the chosen source is a permanent spell, damage dealt later in the turn by the permanent it becomes will also be prevented.

Are any other cards possibly affected by this bug?
-

[Korath]

In dev I can't manage to cast it at all.

Of the other cards with an ability reading "Prevent all damage that a [possibly color-restricted] source would deal [possibly just to you] this turn", testing with an Orcish Artillery targeting myself in all cases, we have Rith's Charm, Prahv, Spires of Order, Auriok Replica, Consulate Surveillance, and five cards that aren't in Manalink. All of them work as described above by Aswan jaguar: They're cast or activated only during the damage prevention step; target a packet of damage; prevent all damage from that packet; don't prevent simultaneous damage from the same source; and, though they each create an effect card, they don't prevent later damage that turn from the same source.

[Korath]

Just stumbled across this again. The dev version:

1. isn't castable, since it doesn't seem to return 99 from EVENT_CAN_CAST; when that's fixed,
2. it targets a damage card at announcement instead of selecting during resolution, and
3. it only prevents the damage of that one damage card, not other damage the same source is simultaneously doing, and
4. it makes no effort whatsoever to prevent damage later in the turn.

[Aswan jaguar]

Fixed only that can't be cast in commit 34a389f4.

[gnomefry]

Just mentioning that like Pay No Heed (since AJ's casting fix), Prahv, Spires of Order remains exclusively activable during end of combat on a specific damage card. Instead, these effects should work more like a single-turn Defang (which does function properly, albeit for creature sources only).

[drool66]

Framework for this in 0b7f768

[Aswan jaguar]

Your framework indeed fixes everything reported.
My observations for improvements and issues:
1) It triggers regeneration effects when there is no need to do so.
1a) I don't know if you want Pay No Heed to prevent damage also with manalink way/timing if you want that then it doesn't do so. Once the damage card has shown no matter if you select the source or the damage card the damage wont be prevented. If you don't want also manalink way, then I think you don't need it to trigger regeneration effects at all.
3) This maybe is a developers choice I guess, but it is very confusing to see an effect card with the picture and text of the source (when the source has text from it's own ability) instead of the effect card of Pay No Heed itself and it's own rules text. I think the way you have done it is good for cards that let you cast other cards and such.
4) I prefer the prevention effect to attach to the source when the source is a permanent. And not attach when the source is a spell on the stack.

[drool66]

Great suggestions as usual. Implemented in 07bd401. I'll try to apply them to the other cards like this soon.