Susreh, Pariah of the Woods

When you cast a spell, you may put a jewel
counter on a land you control.

When you attack with one or more creatures,
proliferate.

{1}{g}{w}, Remove three jewel counters from
permanents you control: Creatures you control get
+3/+3 and gain indestructible until end of turn.
Activate only if Susreh is attacking.