Memory Jar

Set
Urza's Legacy
Rarity
Rare
Text
T, Sacrifice Memory Jar: Each player exiles all cards from their hand face down and draws seven cards. At the beginning of the next end step, each player discards their hand and returns to their hand each card they exiled this way.
Legality
Legal in: Commander, Duel
Banned in: Legacy
Restricted in: Vintage
Rulings
2004-10-04: You can’t look at the cards you exiled until they return to your hand.