Brilliant Ultimatum 
Sorcery
$1.31 #12480 0.44 17.9 years
Exile the top five cards of your library. An opponent separates those cards into two piles. You may play lands and cast spells from one of those piles. If you cast a spell this way, you cast it without paying its mana cost.
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Abstract Performance86%
$0.21↓#117290.00↓0.4 years↓
"Exile the top four cards of your library in a face-down pile, then exile the top four cards of your library in a face-up pile. An opponent chooses one of those piles. Put that pile into your graveyard. Look at the cards in the other pile. You may cast a spell from among them without paying its mana cost. Put the rest into your hand."
Aminatou's Augury72%
$0.40↓#2485↑0.27↓8.1 years↓
"Exile the top eight cards of your library. You may put a land card from among them onto the battlefield. Until end of turn, for each nonland card type, you may cast a spell of that type from among the exiled cards without paying its mana cost."
Hazoret's Undying Fury72%
$0.26↓#24004↓0.23↓9.1 years↓
"Shuffle your library, then exile the top four cards. You may cast any number of spells with mana value 5 or less from among them without paying their mana costs. Lands you control don't untap during your next untap step."
Fact or Fiction70%
$0.19↓#703↑0.26↓25.9 years↑
"Reveal the top five cards of your library. An opponent separates those cards into two piles. Put one pile into your hand and the other into your graveyard."