
TrampleTrampleExcess combat damage it deals to a blocker carries over to the player or planeswalker it's attacking.
Whenever one or more creatures you control with trampletrampleExcess combat damage it deals to a blocker carries over to the player or planeswalker it's attacking. deal combat damage to a player, create an X/X green Dinosaur Beast creature token with trampletrampleExcess combat damage it deals to a blocker carries over to the player or planeswalker it's attacking., where X is the amount of damage those creatures dealt to 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.