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

Playing an item early on means you might get to use it a few times, making it very valuable

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

Artifact - Book Sorcerer Class (Gain the next level as a sorcery to add its ability.) When this Class enters, draw two cards, then discard two cards