Paradise Plume allows the caster to choose a color, spend a mana of chosen color, and whenever a spell of that color is played the controller may gain 1 life.
Defiant Bloodlord is a creature that states whenever the controller gains life, target opponent loses that much life.
My question: If I use Paradise Plume to cast Defiant Bloodlord (results in gaining 1 life), does the 1 life gained from using Paradise Plume to play Defiant Bloodlord trigger Defiant Bloodlord to make an opponent lose 1 life? Or is the life gained prior to Defiant Bloodlord entering the battlefield, resulting in no trigger?