Up until now, you only needed your hands and maybe some original cards for reference, but going forward, you may need some tools to help you in the process
Yavimaya, Cradle of Growth and Urborg, Tomb of Yawgmoth smooth out your color needs while Krosan Verge and Myriad Landscape add some ramp options to the mana base
Plans Plans are a new enchantment subtype coming in Marvel Super Heroes and are considered a Villainous mechanic
Lillies Clefairy ex SIR from Journey Together ($156) Fairy ex Alolan nostalgia sleeper
Its ability to generate a large number of Goblins quickly and overwhelm opponents with sheer numbers (exponential goblin growth!) is what makes Krenko, Mob Boss the best goblin commander there is
The Lost Caverns of Ixalan introduced Map tokens, and a new keyword action, very reminiscent of cascade, thats a favorite among many casual and competitive players