Grizst, Caller of the All

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.)
Ward — tap a land
Whenever you cast a spell with convoke, if it's the
first time this turn, create a 1/1 green mushroom creature token, if it's the second time create a 2/1
red bird creature token with flying, if it's the
third or consecutive time create a 3/3 elemental creature token with "This creature is all colors."