
TeamworkTeamworkAs an additional cost to cast this spell, you may tap any number of creatures you control with total power 2 or more. 2 (As an additional cost to cast this spell, you may tap any number of creatures you control with total power 2 or more.)
Helicarrier Strike deals 2 damage to target attacking or blocking creature. If this spell was cast using teamworkteamworkAs an additional cost to cast this spell, you may tap any number of creatures you control with total power 2 or more., it deals 4 damage to 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.