Dragon's Rage Channeler - 121 U MH2

Whenever you cast a noncreature spell, surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)
Delirium — As long as there are four or more card types among cards in your graveyard, this creature gets +2/+2, has flying, and attacks each combat if able.

uncommon
Creature — Human Shaman
From the Magic: The Gathering set Modern Horizons 2.