Ability costs can include ink (paid by exerting cards in your inkwell), exerted cards (paid by, well, exerting cards) or something else explained on the card itself
Though most of their abilities can also be very effective on their own , such as Julieta Madrigal, who can not only heal your characters, but allows you to draw cards if you do use her ability to do that
You will likely be asked for photo proof
You can push quite a bit of damage with chapter II/III, and the body also blocks rather well for its cost
It's built around casting various noncreature spells, and either burning your opponents if you use Y'shtola as your commander, or amassing a battlefield of tokens if you're using G'raha
Magic: The Gathering Marvels Spider-Man Collector Booster includes: 15 Magic: The Gathering cards