Shapeshifter's Marrow 
Enchantment
$0.47 #25776 0.40 19.3 years
At the beginning of each opponent's upkeep, that player reveals the top card of their library. If it's a creature card, the player puts the card into their graveyard and this enchantment becomes a copy of that card. (If it does, it loses this ability.)
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Cards similar to Shapeshifter's Marrow expected a card that isn't here?
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Vesuvan Drifter76%
$0.33↓#10961↑0.20↓3.3 years↓
"At the beginning of each combat, you may reveal the top card of your library. If you reveal a creature card this way, this creature becomes a copy of that card until end of turn, except it has flying."