You can flip through the gallery below to see nine cards arriving in Jumpstart: Historic Horizons (including two reprints, one from Modern Horizons), and read on to learn how their new mechanics work and why Wizards of the Coast decided to take Arena this direction: Similar to the original Jumpstart, Historic Horizons cards can be added to your collection either by using wildcards or by participating in a timed event (ending September 9) in which you pick two themed packs from a possible 46, combine them into a single deck, and then compete against other players
And without any dual lands or additional mana fixing, a 16-land deck with an 8/8 split of basics is just barely hitting both minimums
These stats certainly place Emrakul amongst the biggest creatures in the game, however, Impervious Greatwurm, Ghalta, Primal Hunger, and other colossally huge creatures have all been implemented into MTG Arena without major difficulty
Since Varragoth only costs three mana to cast, you can start tutoring early for ramp cards like Culling of the Weak, to help you cast your high mana value demons