Gwen, of the Meek and Mighty

Creature spells you cast have convoke (Each
creature you tap while casting that spell pays for {1} or one mana of that creature's color.)

Whenever you cast a spell with convoke for the
first time during your turn, create a 1/1 Elephant Shaman creature token, then untap all creatures
you control.
Creatures you control have vigilance.