cards that you can have any number of mtg Fifth Dawn Uncommon Relentless Rats #58 Relentless Rats gets +1/+1 for each other creature on the battlefield named Relentless Rats Rules Text: can, block, any,

UNIVERSAL COMPATIBILITY: Perfectly sized to fit all standard-sized trading cards, sports cards, and game cards

Classic artifact lands like Seat of the Synod or Great Furnace are also excellent because they come in untapped and fuel all your artifact synergies without costing you deck space

It's very powerful in Commander since so many things care about ETB stuff from the heavily played Mulldrifter and Eternal Witness with their ETB triggers to win cons like Impact Tremors

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Bottomless Pit Bottomless Pit slowly strips each player of their resources without allowing them to choose what to discard