Selvala, Heart of the Wilds Rolling card draw and mana dork in one card, Selvala, Heart of the Wilds makes for one of the best mono-green commanders and frequently shows up in cEDH decks under Sisay, Weatherlight Captains command
Historically, Humans has had a horrific time contending with Arcbound Ravager decks in the Modern format, and finally being able to play Stony Silence on a creature is a dream come true for the archetype
Eminence is one of the most powerful mechanics in all of Magic, and Edgar Markov has one of the best eminence effects, so much so you could just play Vampire cards you found in a bulk bin and still have a great deck
If you resolve Teferi and can untap into casting a Cryptic Command or a Time Warp effect then it is almost impossible to lose from that position
and many named counters (such as soul counters) won't have an effect unless the recipient permanent refers to them in some way
Black-border comes to Un-sets for the very first time
