Obviously it's limited by being a tap ability on a creature and only working on colorless sources, but this is an extremely rare and useful effect, and a lot of the things that get targeted are colorless anyway
I also find I tend to prefer the combo cubes with power or in things like rotisserie so my drafting cube has very little combo - basically just reanimator
1/1 Rat creature with "This creature can't block." for Edgewall Pack, Experimental Confectioner, Gnawing Crescendo, Harried Spearguard, Lord Skitter, Sewer King, Lord Skitter's Butcher, Ogre Chitterlord, Pest Problem, Rat Out, Redcap Gutter-Dweller, Song of Totentanz, Tangled Colony, Totentanz, Swarm Piper, Twisted Sewer-Witch, Voracious Vermin and Warehouse Tabby
A buylist search tool is one of the unique features Cape Fear Games provides to new sellers
It would propably feel right at home in a Precon, good catch