they will only slow the deck down. it is an infinite manna untap creature blink land loop. thus infinitely blinking the land and milling instantly, so i'm not concerned with land dropping the crab, simply getting the creatures i need out and protecting them till the loop is created.
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The creatures and Spells need to be balanced a little more, also I question which of the spells to keep and which to drop in order to do so.
I would add Black to this. There are many spells in black for milling.
I'd look at Preordain, Foresee, Explorer's Scope, Infiltration Lens, and Oculist.