The ability to Fusion summon using monsters from your deck as material is one thing, but with this deck having access to monsters like Albion the Branded Dragon, which allows you to Fusion summon one Level 8 or lower Fusion monster upon being Fusion summoned successfully, its possible to summon multiple powerful Fusion monsters in your opening hand without ceding card advantage by using up the cards in your hand or on the field
What your deck does, what it's power level is, who your Commander is, if there are any infinite combos, etc
Final Fantasy IV's Cecil, for example, has an entire mechanic around transforming from a Dark Knight into a Paladin
Besides that, Kaito loves to draw cards regardless of what form he comes in, and don't forget Dimir spells like Lim-Dul's Vault , Consult the Necrosages , or Siphon Insight
However, you only need to take down a max of three Pokmon, and Mega Charizard Y ex has more than enough HP to tank that damage