When playing Blessed Reversal is it treated as a single life gain event regardless of how many creatures are attacking? Or is each "3 life" treated as a separate event.
I'm asking because with Heliod, Sun Crowned "Whenever you gain life, put a +1/+1 counter on target creature or enchantment you control." So if 10 creatures attack and I play Blessed Reversal, do I get 10 counters or 1 counter?