You can refill your hand with ease if you can create a bunch of X/1 creatures, making Skullclamp one of the best card-drawing artifacts in the game
At least the effects on the summon side of Jill are on theme with ice and tapping down your opponent's creatures
Plus, as a Mono-Black deck, we're not great at killing things like artifacts and enchantments, and Summon: Bahamut gives us a way to answer these permanents
At least one of our opponents is always going to offer a nice discount on our beefy 6/6, flying, trample, haste Dragon
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If you like connecting with your Commander early or want to explore Historic, Assassin, or Pirate synergies, theres a lot for you here to look at