Even just +2/+2 and protection from two colors is a huge problem in a lot of games with everyone playing two color decks, theres a pretty good chance Red or Green is one of their colors
Mono-blue decks should lean heavily on 2-mana rocks (8-10 pieces minimum) since blue lacks natural land acceleration, with Arcane Signet, Mind Stone, Sky Diamond, and Thought Vessel forming your core
We should be nearing the end of the Lost Caverns of Ixalan hype cycle, but keep an eye out for the release of the Commander themes for Murders at Karlov Manor, because the process will start over again in a few weeks once spoiler season kicks off
Putting the Azorius artifacts deck aside, Cori-Steel Cutter rules the entire format
The strength of Chandra's Ignition comes from being able to deal damage to each opponent
This is why Sin puts counters on another creature and then shuffles itself into the library, representing the Calm before its eventual return