Nickelback

Haste.
Return Nickelback to your command zone at the end of your turn.
Each time you play Nickelback place a +1/+1 counter on Nickelback and reduce his cost by {1}.
At the beginning of the game reveal your library. Your library may only contain basic lands and Nickelback songs. Shuffle your library.
You may have as many copies of a Nickelback song in your deck as you wish.