The Keeper of the Yellow Hat

Unknown Event (UNK) #RZ02b · Rare · Legendary Creature — Human Wizard

Mana cost: {W}{U}

You can't cast Keeper of the Yellow Hat during your first seven turns of the game. (Keep track if you're playing with this!)
When The Keeper of the Yellow Hat enters the battlefield, create a legendary artifact equipment token named Yellow Hat with equip {2} and "Equipped creature gets +4/+4 and gains lifelink."