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You choose the color as the ability resolves

It effectively transforms your discard pile into a strategic second hand by granting nonland cards mayhem

The offspring 4 is a lot to duplicate that effect, way more playable at 2 and you are going to be able to repeat it because of what your deck does

Creature - Wolf Color tag templates(None) Witchstalker Hexproof (This creature can't be the target of spells or abilities your opponents control.) Whenever an opponent casts a blue or black spell during your turn, put a +1/+1 counter on this creature

And I like the fact that it enables many strategies almost by itself, making cards like Unholy Heat and Traverse the Ulvenwald shine in multiple decks (even in Yorion piles)