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This is comparable to the different colors of Magic the Gathering cards

Mindslicer None of your opponents really need hands, right

For instance, a grave-counting creature like Wight of Precinct Six or Nighthowler would fit the idea of King growing with more guys in the yard, but they would also be disappointingly weak right now since you don't have a lot of mass self-mill at the moment (Stitcher's Supplier and Overlord of the Balemurk are the first things that comes to my mind)

Might I suggest something like Sprout Swarm

Combos and Interactions Counterspells that untap lands like Unwind and Rewind are very interesting when your deck has symmetric lock pieces and cost reduction