#1: Yawgmoths Will Yawgmoths Will can be easy for non-Vintage players to underestimate since so many lists seem to feature just two Yawgmoths Wills, even when people could have played four
Instead, it has players tally up all permanents and then sacrifice down to the person with the fewest, which is often the player in the weakest position
Because a player can usually only attack on the second turn of the game and any other turn in the match, a player who goes first might not use this card, but Meloetta ex might change this going forward
Sigurd, Jarl of Ravensthorpe
Faerie Artisans To mirror an opponent's moves while making some of your own seems like an advantage in almost any circumstance
Bring tokens for creature-generating effects, extra counters for various mechanics, and consider a playmat since Commander games typically involve more cards on the battlefield than other formats