
Commander creatures you ownCommander creatures you ownYou can't be targeted, dealt damage, or enchanted by anything controlled by that player. have "When this creature enters and at the beginning of your upkeep, each player may put two +1/+1 counters on a creature they control. For each opponent who does, you gain protection from that player until your next turn." (You can't be targeted, dealt damage, or enchanted by anything controlled by that player.)
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Read from the rules text. A card that enables a keyword makes or is the thing; a card that rewards it gets better when you have it. Two cards interact when one enables what the other rewards.
A Background can be a second commander alongside any creature with Choose a Background.