Xon'irit, the Collossal

+7: Put a +1/+1 counter on each nontoken Eldrazi creature you control, then put a +1/+1 counter on target Eldrazi creature.
-19: Create a colorless X/X Eldrazi creature token with haste and indestructible, where X is the number of cards in your library. Draw four cards.
: Xon'irit, the Colossal can be your commander. As long as it is in your command zone, the first spell you cast each turn costs {1} less to cast.