Squire's Devotion
Enchantment — Aura
Enchant creature
Enchanted creature gets +1/+1 and has lifelink.
When Squire's Devotion enters the battlefield, create a 1/1 white Vampire creature token with lifelink.
Illustrated by
Rivals of Ixalan#25CommonEnglishLegality
Rulings
Jan 19, 2018
You need a creature for Squire’s Devotion to target as you cast it. There’s no way to have it enter the battlefield attached to the Vampire token it’ll create.
Jan 19, 2018
If the creature this Aura would enchant is an illegal target by the time Squire’s Devotion tries to resolve, the Aura spell doesn’t resolve. It won’t enter the battlefield, so its ability won’t trigger.