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HasteHasteCan attack and use tap abilities the turn it comes under your control.
BoastBoastActivate only if this creature attacked this turn and only once each turn. — 
: You may have Arni's base power become 1 plus the greatest power among other creatures you control until end of turn. (Activate only if this creature attacked this turn and only once each turn.)
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.
