
At the beginning of your end step, if there is no monarch, target opponent becomes the monarchthe monarchThe monarch draws a card at the end of their turn. A player whose creature deals combat damage to the monarch becomes the monarch instead..
Whenever a creature attacks one of your opponents, if that player is the monarchthe monarchThe monarch draws a card at the end of their turn. A player whose creature deals combat damage to the monarch becomes the monarch instead., that creature gets +1/+1 and gains trample until end of turn.
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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.