There are so many directions to go when building new decks for the upcoming Into the Inklands metagame
Adagia, Windswept Bastion Alpharael, Stonechosen Anticausal Vestige Cosmogrand Zenith Dawnsire, Sunstar Dreadnought Devastating Onslaught Evendo, Waking Haven Exalted Sunborn Famished Worldsire Icetill Explorer Kavaron, Memorial World Mutinous Massacre Ouroboroid Quantum Riddler Sami, Wildcat Captain Secluded Starforge Sothera, the Supervoid Starfield Vocalist Susur Secundi, Void Altar Tannuk, Steadfast Second Tezzeret, Cruel Captain The Dominion Bracelet The Endstone Uthros, Titanic Godcore Weftwalking
You arent going to be interested in the 7-mana door, but its a free bonus, and you could cheat on the mana by unlocking it with a different effect
This card actually kind of downplays that asset, which is sort of a shame
It introduced an absurd number of new cards that can serve as your new Commander and hundreds of new cards that can be part of the 99