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Why Magic: The Gathering's Partner Creatures Are OP in Commander The main reason why Creatures with Partner are problematic is not necessarily that players have access to two Commanders in the Command Zone, but rather that two of these Creatures can be combined to give decks a new color identity
Neither ability cares who controlled the creature that died, only which graveyard it was put into
One curious aspect of this card is that it has a much faster infinite combo with Chain of Acid, which lets you copy infinite spells and win via the magecraft mechanic, but that can be done with any indestructible artifact
This cares about Commander and multiplayer, but not formats like Type Four, Highlander, or Five Color or Pauper, just Commander specifically and multiplayer generally