Norien, Selesnya Summoner

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)
Conclave - As long as you control three or more creature tokens, you can't lose life.
At the beginning of your upkeep, populate. (Put a token onto the battlefield that's a copy
of a creature token you control.)