The same goes for Zuko, who starts out as mono-red but ultimately becomes red-white-black (or Mardu)
The Sideboard The cards in our sideboard are designed to do three things: help improve our matchup against aggressive creature decks (by far our worst matchup), fight three-mana planeswalkers (especially Teferi, Time Raveler but also Narset, Parter of Veils and Oko, Thief of Crowns), and answer graveyard-based decks (which we actually help by filling their graveyard with our mill spells)
Also, because we like subverting tropes, we had this card showing a woman freeing a man from the curse rather than vice versa
Tirrel in particular is a complete beating being able to easily ultimate the turn after she comes down and gain a pack of life in the process
Etchings of the Chosen One enchantment to rule them all
The payoff of creating tokens for casting noncreature spells is the main focus