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Rulings
Each creature you control has Rishkar's mana ability as long as that creature has any kind of counter on it. The effect isn't limited to those with +1/+1 counters.
You can't target the same creature twice to have one recipient get two +1/+1 counters.
Rishkar can be a target of its own triggered ability.
You can't target the same creature twice to have one recipient get two +1/+1 counters.
Rishkar can be a target of its own triggered ability.
Rulings
Each creature you control has Rishkar's mana ability as long as that creature has any kind of counter on it. The effect isn't limited to those with +1/+1 counters.
You can't target the same creature twice to have one recipient get two +1/+1 counters.
Rishkar can be a target of its own triggered ability.
You can't target the same creature twice to have one recipient get two +1/+1 counters.
Rishkar can be a target of its own triggered ability.
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