When it attacks, look at the power of each creature you control. If the power is greater than its base power, you put +1/+1 counters on it based on the difference between those numbers. So if you have a Walking Ballista with 1 counter it’ll put an additional +1/+1 counter (since Ballista has base p/t of 0/0) If you Giant Growth that Ballista before combat it’ll be a 4/4 and you’ll put 4 counters in it instead.
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I cannot figure out what it’s trying to say
When it attacks, look at the power of each creature you control. If the power is greater than its base power, you put +1/+1 counters on it based on the difference between those numbers. So if you have a Walking Ballista with 1 counter it’ll put an additional +1/+1 counter (since Ballista has base p/t of 0/0) If you Giant Growth that Ballista before combat it’ll be a 4/4 and you’ll put 4 counters in it instead.