Willam, Houndmaster

Whenever Willam, Houndmaster enters the battlefield, create Fergus, a legendary 2/1 white Dog creature token with first strike and vigilance.
Position 2 or 3 — {2}{g/w}: Mark target creature.
(Marked targets can be attacked by creatures with Marked Attack)
"A lawman and his faithful beast - a bond forged by battle and bloodshed,"
— the Ancestor