Idrum, Qamaru Chief

At the beginning of each end step, if you created
a creature token this turn, put a muster counter
on Idrum and then create a number of 1/1 green
and blue Merfolk Soldier creature tokens with
hexproof equal to the number of muster counters
on it.

At the beginning of your upkeep, remove all muster
counters from it. You gain that much life.