
TrampleTrampleExcess combat damage it deals to a blocker carries over to the player or planeswalker it's attacking.
LandfallLandfallAbility word: triggers whenever a land enters under your control. — Whenever a land you control enters, put a +1/+1 counter on target creature you control. If this is the second time this ability has resolved this turn, doubledoubleAll spells and abilities cast, activated, or triggered by you are copied. Mana abilities produce twice as much mana. the number of +1/+1 counters on that creature 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.