The Traveler

X: Until the end of the turn The Traveler is an X/X avatar creature where X is the number of creatures that share a type on the battlefield.
-2: Exile target creature. It's controller puts a 1/1 changeling creature token.
-5: Draw cards equal to the number of creatures that share a type on the battlefield. You get an emblem that say 'you have no maximum hand size'