choose a card type mtg Herald's Horn (40K) #241 Creatures you control of the chosen type get +1/+1 Icon of Ancestry from Warhammer

Its great for combat and against damage-based sweepers, but its also highly vulnerable to Naturalize effects

You have cumulative upkeep of one, so it doesn't last forever, but you are dropping one land per turn, so as long as you hit your land drop, this can be kept up for a few turns

Planeswalkers I wont lean super-hard on planeswalker cards because they tend to draw a lot of heat in a game of Commander, but they work so well with proliferate Ill likely pepper in a handful of them

Id imagine well eventually see some sort of UB Masters-type set, in which case Pre-War Formalwear may make another appearance

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The cost to play them requires some mana of that color and potentially any amount of mana from any other color