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But then it hit me like a truck: Raffine would be an amazing Sliver commander thanks to his ability to draw cards and buff Slivers

You also wont be forced to play one or two drops that dont fit your strategy just for the sake of cheapening your late game cards

All you need to do is flood your board with plenty of creatures with one toughness, and suddenly you can pay one mana to draw two cards as often as you want

Jet Medallion, Bolass Citadel, draw spells, tutors, and black cards that lack colorless requirements in their mana costs tend to work best with Krrik, as they help you stretch your mana and card access into ridiculously explosive turns that can win you the game on the spot if your opponents dont have access to any interaction

While Windgraces ultimate ability can be good, its first two abilities are probably going to do the most work for you and keep your game consistent