It of Fallen Snow

Whenever you cast a colorless permanent, create a number of 0/1 Eldrazi Spawn creature tokens with (sacrifice this creature: add{c}) equal to half its mana cost rounded down.

Colorless attacking creatures you control gain +0/+2 and Lifelink untill end of turn.

Colorless defending creatures you control gain +0/+4 untill end of turn.