Creature — Beast 4/4, 2UU (4)
Rare
Flying
Your maximum hand size is reduced by four.
Thinking is hard.
Illus. Jim Nelson

10/1/2009: If multiple effects modify your hand size, apply them in timestamp order. For example, if you are affected by Cursed Rack (an artifact that sets a player's maximum hand size to four) and then put Thought Devourer onto the battlefield, your maximum hand size would be zero. However, if those permanents entered the battlefield in the opposite order, your maximum hand size would be four.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Classic (MTGO)
Legal in Commander