
First strikeFirst strikeDeals combat damage before creatures without first strike., hastehasteCan attack and use tap abilities the turn it comes under your control.
UnleashUnleashYou may have this creature enter with a +1/+1 counter on it. It can't block as long as it has a +1/+1 counter on it. (You may have this creature enter with a +1/+1 counter on it. It can't block as long as it has a +1/+1 counter on it.)
Each other creature you control with a +1/+1 counter on it has hastehasteCan attack and use tap abilities the turn it comes under your control..
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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.