Null Summoner

Creature — Human Warlock — {2}{U}{B}

When this creature enters, if you cast it, target opponent reveals their hand. You choose a nonland card from it. Exile that card.
Threshold — As long as there are seven or more cards in your graveyard, you may cast the exiled card, and mana of any type can be spent to cast that spell.

Rarity: rare

EDHREC rank: 31330