Equipped creature has "{T}: This creature deals 1 damage to target player or planeswalker. If this creature is a Wizard, it deals 2 damage instead." Equip {3}
2018-04-27
The equipped creature, not Sorcerer's Wand, is the source of the damage-dealing ability and of the damage dealt.
2018-04-27
Whether the equipped creature is a Wizard is checked only as the ability resolves. If that creature has left the battlefield, use its last known information to determine if it was a Wizard.