Oath of Elspeth

When Oath of Elspeth enters the battlefield,
create a 4/4 White Avatar creature token with Vigilance.
Whenever a planeswalker enters the battlefield
under your control, create X 2/2 Black Zombie creature tokens where X is that planeswalkers starting loyalty.
"To end the threat of Bolas and the Phyrexians, I'll
keep watch."