Golden-Antlered Stag

Landfall - Whenever a land enters the battlefield
under your control, create a colorless treasure
artifact token with "{t}, sacrifice this artifact: add
one mana of any type.".
Whenever Golden-Antlered Stag attacks, it gets
+X/+X until end of turn where X is the number
of treasures you control.
As its antlers grow, so does its power