
Partner withPartner withWhen this creature enters, target player may put Toothy into their hand from their library, then shuffle. Toothy, Imaginary Friend (When this creature enters, target player may put Toothy into their hand from their library, then shuffle.)
If one or more counters would be put on a permanent your team controls, that many plus one of each of those kinds of counters are put on that permanent instead.
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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.
Partner with names one specific card. The two can be your commanders together, and each can fetch the other.