Because it both tutor a creature into your hand for playing and another into your graveyard for abuse, it fits multiple decks
At the beginning of your next upkeep, you may cast this card from exile without paying its mana cost.) Watermark: Ojutai Illustrated by Igor Kieryluk Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Not Legal Modern Legal Brawl Not Legal Legacy Legal Comp
Then the God of Slaughter is up your aisle

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Whenever this creature deals combat damage to a player, you may draw a card
There's also a lot of these effects running around, which could lead to a scenario where you are drawing 10+ cards per turn