Phantom Shadow

Creatures with power less than Phantom Shadow's power can't block it.
Class Promotion Ranger (You may cast this spell by sacrificing a Ranger and pay it's mana cost reduced by that creature's converted mana cost.)
{x}{x}, {t}: Create X colorless Trap artifact tokens with X charge counter on it. It has "{t}, Sacrifice this artifact: deals X damage target attacking creature, where X is number of charge counters on it."