a deck can have any number of cards named mtg RELENTLESS RATS X4 Masters 25 Magic MINT CARD o:"a deck can have any

Regrowth and gravedigger effects do the same thing after your card's gone to the graveyard

Enduring Scalelord + Altered Ego When talking about infinite combos, most people think about life or mana, but infinite counters are also a thing

Or as many as you can keep around as you attack turn after turn

In theory, if there were enough pressure from players, this could lead to wider changes, such as cards being removed from the Reserved List

Counters, auras, and other modifications common to voltron commander decks will stay stuck to their creatures through phase-out and phase-in

It starts outside the game and doesn't count as one of your 100 cards