BUG-Blight X and Undying not working properly
Scenario Young wolf base power and toughness 1/1 (has Undying keyword) has a +1/+1 counter on it so at 2/2. is hit with Blight 2. according to the rules -1/-1 counter and +1/+1 counters negate each other so the expected result is the wolf ends with a -1/-1 counter and dies goes to the gravyard and undying should trigger returning the wolf with a +1/+1 counter on it.
Dragonsong#40013
shared this idea
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Rezzahan#77802
commented
State based actions from the same check happen at the same time. Both the Wolf dying for having 0 or less toughness and the counters annihilating each other are state based actions, and they happen from the same check here. Unfortunately for you, leaves-the-battlefield triggers, like undying and all "dies" triggers, trigger based on the game state prior to the event. And prior to the wolf dying it had both +1/+1 counters and -1/-1 counters. The former keeps undying from triggering, because it died with a +1/+1 counter on it.