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Being able to get chaff off the top of your library is always a good move, and for four mana Carth does it excellently

MagicCon: Minneapolis Folks near Minnesota have a new MagicCon to look forward to this weekend in MagicCon: Minneapolis

A Commander that cares about instants an sorceries in our graveyard would be Dralnu, Lich Lord

The Unfinity set has a couple options too, but just about all of them are weak uncommon Draft fodder

The only drawback to Brightstone Ritual is that you need to be running a decent amount of goblins in your deck to get decent mileage out of it, and it's best used in a goblin tribal build