If a creature is attacking a planeswalker, that planeswalker's controller is the defending player
Illustrated by Lie Setiawan Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Not Legal Brawl Not Legal Legacy Legal Comp
Bring it back Wizards
Smee, Loyal First Mate Common 16 Prince Phillip, Dragonslayer Uncommon 17 Pumbaa, Friendly Warthog Common 18 Rapunzel, Gifted with Healing Legendary 19 Sebastian, Court Composer Common 20 Simba, Protective Cub Common 21 Stitch, Carefree Surfer Legendary 22 Stitch, New Dog Common 23 Stitch, Rock Star Super Rare 24 Timon, Grub Rustler Common 25 Be Our Guest Uncommon 26 Control Your Temper
Oops All Spells decks in other formats have to stretch themselves really thin when it comes to playing non-land mana sources, but in Vintage you just get the all of the Moxen and other fast mana like Sol Ring