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Then there are the insular abilities of the pro-colorless cards, and those usually don't make a Top 10 list like this

Each player discards his hand, and draws a full new hand of seven cards, for only three mana

(Be aware that your opponent can break up this loop with a Purify the Grave or a Dissipate to remove your Runic Repetition.) Support Cards Silent Departure, Grasp of Phantoms, and Gnaw to the Bone are three of the best support cards that this deck can get its hands on

Another nice aspect of prowess is that when you have a decent amount of it you can build around it

Fateseal N Fateseal basically lets you scry the top of your opponents library