
First strikeFirst strikeDeals combat damage before creatures without first strike., trampletrampleExcess combat damage it deals to a blocker carries over to the player or planeswalker it's attacking., lifelinklifelinkDamage dealt by this also causes you to gain that much life.
Stagger — Whenever Lightning deals combat damage to a player, until your next turn, if a source would deal damage to that player or a permanent that player controls, it deals doubledoubleAll spells and abilities cast, activated, or triggered by you are copied. Mana abilities produce twice as much mana. that damage 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.