
First strikeFirst strikeDeals combat damage before creatures without first strike., vigilancevigilanceAttacking doesn't cause this creature to tap., trampletrampleExcess combat damage it deals to a blocker carries over to the player or planeswalker it's attacking.
At the beginning of combat on your turn, another target Elemental you control gains myriad until end of turn. (Whenever it attacks, for each opponent other than defending player, you may create a token copy that's tapped and attacking that player or a planeswalker they control. Exile the tokens at end of combat.)
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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.