mtg wither commander deck Magic: The Gathering Secrets of Strixhaven Magic: The Gathering Witherbloom Pestilence

If an opponent casts a creature spell with flash while the token is attacking or blocking, the token is removed from combat because it stops being a creature

The artifact requires a pretty high cost to get the chain started, though - four mana (or three and two life) to cast, then two mana (or one and two life), a tapped card and a sacrificed creature to set its ability in motion

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The first is Ainok Strike Leader, a bear who when it or your commander attack it creates a 1/1 goblin attacking each opponent

So, if she is in play when you put a creature with Persist into play, you'll basically cancel the -1/-1 effect out