
When Brinelin enters and whenever you cast a spell with mana valuemana valueThe total amount of mana in a card's cost, ignoring colour. A card costing has mana value 4. X counts as 0 except on the stack. 6 or greater, you may return target nonland permanent to its owner's hand.
PartnerPartnerYou can have two commanders if both have partner. (You can have two commanders if both have partner.)
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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.
Any two cards with plain Partner can be your commanders together. The deck's colours are both cards' colours combined. Showing 36 of 69, yours first.