For those unfamiliar with Archenemy, it is a format in which three players join forces and face off against a fourth, who takes the role of a "final boss" type figure for the other players to attempt to defeat
Capsize gave blue the ability to remove any threat from the board (temporarily in most cases) over and over again, as an instant
Emmara, Soul of the Accord [Best Token Commander for Tap-Based Token Generation] Emmara is the best token commander if you want a safe way to generate tokens
Tawnos's ability targets an ability that is on the stack and creates another instance of that ability on the stack
Drain synergies on Bastion of Remembrance, pingers like Thermo-Alchemist, and consistent noncombat damage from a card like Chandra, Awakened Inferno, spell doom for players that can't engage in combat
One of the finest MTG Spider-Man spoilers yet arrived yesterday, the blue instant spell Secret Identity