The first is that you can only sensibly use Channel to play colourless cards limiting you to Eldrazi, Colossus and potentially some of the 6 and 7 mana artifact dorks
The sheet has four of them so you can print it once and cut out one for your card area, one for the wallet, one for the car and one for wherever else you might open some packs or mail
Paradoxically, it may fit best in decks with a heavy investment in green ramp spells to maximize the number of charge counters obtained each turn

Magic: The Gathering | Marvels Spider-Man Products Play Boosters Each Play Booster box includes 30 Play Boosters, each containing the following: 14 Magic: The Gathering cards: 67 Commons 3 Uncommons 1 Wildcard of any rarity 1 Rare or mythic rare 1 Traditional foil card of any rarity 1 Basic land 01 MAR card 1 Non-foil double-sided token Collector Boosters Each Collector Booster box includes 12 Collector Boosters, each containing the following: 15 Magic: The Gathering cards: 5 Traditional foil commons 4 Traditional foil uncommons 1 Traditional foil basic land 1 Traditional foil rare or mythic rare 2 Non-foil Booster Fun rare or mythic rare cards 1 MAR card 1 Traditional foil Booster Fun rare or mythic rare 1 Art card or traditional foil double-sided token Bundles Each Magic: The Gathering | Marvels Spider-Man Bundle contains: 9 Magic: The Gathering | Marvels Spider-Man Play Boosters 30 Basic lands 1 Alternate-art promo card 2 Reference cards 1 Spindown die 1 Magic: The Gathering | Marvels Spider-Man card-storage box Spideys Spectacular Showdown Scene Box Swing into action with Spideys Spectacular Showdown Scene Box

Of the 12 cards revealed from the Final Fantasy main set so far, one certainly stands out as a potential tool to affect multiple competitive environments: Emet-Selch, Unsundered