Mural of the Last Alliance

Creatures you control get +1/+1.
Whenever you cast a spell, if it shares a color
with another nonland permanent you control,
create a 1/1 white Human Soldier creature token
with lifelink.
Sacrifice Mural of the Last Alliance: Put a +1/+1
counter on each creature you control for each
color among permanents you control. Activate
this ability only during your upkeep.