cards that you can have any number of mtg Fifth Dawn Uncommon Relentless Rats #58 A deck can have any number of cards named Relentless Rats. Ranking Every “A Deck Can

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

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

That makes it a 5-color card, in terms of Commander

At Level 1 it can allow you to roll additional dice for your dice roll abilities and at Level 2 it can give one of your creatures +2/+0 and Menace to help get in for some damage

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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