Izardle, the Summoner

Haste, Reach, Lifelink
Whenever Izardle enters or attacks, create "Raz", a 1/1 legendary colorless Eldrazi Dragon creature token with Flying and "{t}: Add two mana of any color. "
{x}, Sacrifice Raz: Exile the top card of your library until you remove a nonland card with mana value X or greater. You may cast it by paying life equal to its mana cost. A permanent cast this way enters with two finality counters on it. Put all cards exiled this way on the bottom of your library, then shuffle.