Cards from the Mystical Archive can be found in both set and draft boosters for Strixhaven, meaning Snakeskin Veil and its fellows will be playable in any Limited format game where they are pulled
Seismitoad EX was a terror of the era that dominated for almost its entire legality, thanks to its powerful item lock and strong damage output that allows you to trap your foe in a corner with few options
So knowing these things, you'll always want to use Mega Evolution cards with caution, with that being said, if you want some major power in your deck I would definitely consider using Aggron EX and Mega Aggron EX
Zombies Example Decklist Why Zombies is Viable Zombies share some similarities to Chaos Recruiters, being a powerful aggressive deck that can be backed by Creature Swap and Trap Dustshoot
The set also comes with premium accessories such as a card box, Pokmon coin, acrylic damage counters, and condition markers
Theres obviously a mana value restriction on what works here, but Chulane doesnt tap for mana and costs 5 itself, so maybe they meet in the middle somewhere