Grimm, Slumbering Colossus

Indestructible, Reach
Ignus, the Slumbering Titan enters the battlefield tapped with five slumber counters on it. As long as it has a slumber counter on it, it's a land that has "{t}:{g/u}{r/g}{u/r}, spend this mana only on giant creature spells"
Whenever a Giant creature you control attacks, remove a slumber counter from Ignus. When the last slumber counter is removed this way, Grimm deals damage to each non-giant creature equal to it's power.