For example, I have a Black/White deck built around life gain. If I have 2 creatures that cause me to gain 1 life with every creature summon and 1 creature with "if you would gain life, gain that much life +1"...
When I play a creature would I gain +1 (summon) +1 (summon) and then +1 (additional) totalling 3
Or would I gain +1 (summon) +1 (additional) and then +1 (summon) +1 (additional) totalling 4
I guess the question is does it trigger for every instance of me gaining life, or just the fact I have done that turn.