
BackupBackupWhen this creature enters, put a +1/+1 counter on target creature. If that's another creature, it gains the following ability until end of turn. 1 (When this creature enters, put a +1/+1 counter on target creature. If that's another creature, it gains the following ability until end of turn.)
Whenever this creature attacks, doubledoubleAll spells and abilities cast, activated, or triggered by you are copied. Mana abilities produce twice as much mana. the number of +1/+1 counters on target creature. That creature can't be blocked by creatures with power 2 or less this turn.
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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.