Maximizing this Sultai commander requires combining creatures with lots of keyword abilities (Nightveil Predator, Venomthrope) with cards that sacrifice them (Phyrexian Altar, Deadly Dispute) to stack a bunch of keywords on Rayami
Instead, what I saw when I played Expanded was a format with many different strategies
With over 27,000 different cards printed (and counting) printed over the history of Magic: The Gathering , anyone who claims to know exactly how all of them work is probably not telling the whole truth
Meowscarada EX is perfect for the Kingambit from Shrouded Fable, which has an attack where, if the opponent's Pokemon has four or more damage counters, it will be instantly knocked out
it does very little against their deck and you need your Aether Vials online so you can use your lands to attack theirs at every opportunity
In addition, the rotation will reduce the pull of available cards and therefore will effectively limit the cards that can interact with any newly released cards