The first Room costs five front end to make all of your nonland enchantments for things like your wins cons, and then the later three cost will lets your casting of those grow your team permanently in size with +1/+1 counters of it's mana value, red zone win con
SpiderMan Scene Box: Spideys Spectacular Showdown | Magic: The Gathering
1 Marrow-Gnawer Fear The Rats Marrow-Gnawer is the primary commander for Rat decks if you're building one, and even if you aren't using it as a commander, it's the best Rat card there is
(Players dealt combat damage by them also get a poison counter.) Corrupted At the beginning of your upkeep, if an opponent has three or more poison counters, choose a creature you control, then draw cards equal to its total toxic value
#6 Salon del Senor de los bandidos: Hall of the Bandit Lord in Spanish
He credits that jump to two things: a boom in collectible card games, especially Pokmon, and his company's push into livestreaming