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Double strikeDouble strikeDeals both first-strike and regular combat damage., hastehasteCan attack and use tap abilities the turn it comes under your control.
Whenever this creature attacks, you get 
(two energy counters), then you may pay eight . If you pay, untap all creatures you control, and after this phase, there is an additional combat phase.
Hover an underlined rule to see what it means.
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.
