Whenever equipped creature deals combat damage to a player, you may cast an instant or sorcery spell from your hand with mana value less than or equal to that damage without paying its mana cost
Ask someone to name every card type Magic has ever had
Such as with this Espeon EX, which originally went for over $375, but luckily, the Eevee fever died down, and now it is worth less than $200
Copying the +1 on Teferi, Temporal Archmage to untap extra permanents gives you huge mana swings, and copying the X from Tezzeret the Seeker can fetch multiple artifacts in one turn
Each face of a transforming double-faced card has its own set of characteristics: name, types, subtypes, abilities, and so on
There is a real case for Yuna's high degree of open utility here, so make of that what you will