That there exists an even more expensive, even more packed, and even more financially questionable purchase out there
The transformed Sephiroth is a 5/5 Avatar Nightmare Angel with Flying, and whenever he attacks, you can sacrifice any number of creatures and draw that many cards
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They just so happen to also be creatures that can attack
This is easily accomplished with Teddiursa, who attacks for 20 and does 10 damage to himself, or, more simply, a Rainbow Energy