Multiple Serra Paragon on battlefield bug

[frikiluser]

Hi,

I've noticed when multiple Serra Paragon are on battlefield I can play a fetchland and it gains multiple instances of gain 2 life.

Regards,

[padfoothelix]

I noticed this bug too while working on [[The Fourth Doctor]].

The problem is that when the checkTrigger method in SerraParagonTriggeredAbility checks that a card was played via Serra Paragon's ability, the logic used (event.hasApprovingIdentifier(MageIdentifier.SerraParagonWatcher) doesn't distinguish between different Serra Paragons. So when a card is played thus, all Serra Paragon trigger and the cards gains the ability as many times as there are Paragons. It needs to check that the approving object is the right one, not just the identifier. I believe I have a fix, will propose it shortly in #13731 .

I don't think this concerns other cards. In most similar cards, a reflexive ability can be created at the end of the effect that lets players play cards, but this is not the case for Serra Paragon and The Fourth Doctor, because the effect is an AsThoughEffect. This was discussed in #13731.

[github-actions[bot]]

The Fourth Doctor - (Gatherer) (Scryfall) (EDHREC)

{2}{G}{U} Legendary Creature — Time Lord Doctor 4/4 You may look at the top card of your library any time. Would You Like A...? — Once each turn, you may play a historic land or cast a historic spell from the top of your library. When you do, create a Food token. (Artifacts, legendaries, and Sagas are historic.)

[JayDi85]

[[Serra Paragon]]

[github-actions[bot]]

Serra Paragon - (Gatherer) (Scryfall) (EDHREC)

{2}{W}{W} Creature — Angel 3/4 Flying Once during each of your turns, you may play a land from your graveyard or cast a permanent spell with mana value 3 or less from your graveyard. If you do, it gains "When this permanent is put into a graveyard from the battlefield, exile it and you gain 2 life."

[JayDi85]

Possible fix:

Watcher can be per card, so you can add ability.originalid by watcher constructor (originalId will be same between copied abilities or cards) while creating a card and check it with identifier. Card id also will works (but not sure about copied cards).