This with devourers, gravity's black hole and some nightfall should do the trick, or with earthquake and devourers.
it would fit perfectly in a denial deck,
and to everyone who claims its op'd, its just a pain in the *ss for rainbows,
mono decks, like BP says, won't get hurt that much.
Tho, the fact that it's kinda cheap makes it playable quite fast for extreme rainbow denial, don't really like the idea of that...