Hollowsage 

Creature — Merfolk Wizard
Whenever this creature becomes untapped, you may have target player discard a card.
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Cards that do something similar expected a card that isn't here?
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Disciple of Deceit 81%
$0.21#16836
"Whenever this creature becomes untapped, you may discard a nonland card. If you do, search your library for a card with the same mana value as that card, reveal it, put it into your hand, then shuffle."