If you don't mind me asking, why do you want to use a rainbow deck in ELO?
Actually, I'll tack on to bokneehog
Mahimatah should go to a risky card I think, to act as a backup nuke.
I think that any of the 7/4 +x Life cards would do.
Chiara Cr works perfectly.
As far as Spiaghi, I think I'd rather see a card who can strike offensively if needed in there, so I'll nominate Lehane
Good choices though Bokneehog
How have you had success when your elo record is 1100 ?