Artefato — Equipamento
A criatura equipada recebe +2/+2.
Toda vez que a criatura equipada atacar o jogador com mais pontos de vida ou empatado pelo maior total de pontos de vida, crie uma ficha de criatura branca 4/4 do tipo Anjo com voar virada e atacando aquele jogador.
Equipar

Seraphic Greatsword's triggered ability won't trigger if the equipped creature attacks a planeswalker controlled by the player with the most life.
Once the triggered ability triggers, it doesn't matter what happens to players' life totals before the ability resolves. You'll create an Angel token even if the player the equipped creature attacked doesn't have the most life as the ability resolves.
Although the Angel token created by the triggered ability is attacking, it was never declared as an attacking creature (for the purposes of abilities that trigger whenever a creature attacks, for example).