Immaculate Magistrate

{T}: Put a +1/+1 counter on target creature for each Elf you control.

Elves of the immaculate class weave flora into living creatures—sometimes to endorse an elite warrior, sometimes to create a breathing work of art.

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The target creature doesn't have to be an Elf.

The number of counters to put on the target creature is determined only as Immaculate Magistrate's ability resolves. Elves coming and going later won't cause that creature to gain or lose +1/+1 counters.