Maybe one like Sol Ring.
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I like the idea, but Griselbrand is banned, so you should take that out and maybe add a card for more mana.
Slaughter Games is SUPER OP against a shadowborn apostle deck. WOW.
He can shuffle his Shadowborn Apostles into his deck with elixir of immortality if he uses its ability. Otherwise it should have more options like that.
this isn't storm. fix the tags.
I'm gonna try this deck out... but with a couple of additions. Maybe some other multicolored creatures other than chromanticores. Maybe some good one or two drops.