In the article announcing the banning, Wizards suggested that it was willing to see if players would tolerate a "skill-testing, one-deck metagame." As such, it seems that a deck being 75% of the format doesn't automatically necessitate a banning
Still, Everyone's Invited is a fun deck to play with and would be a great deck even for players new to the format, as it's fairly straightforward to play with and focuses on damage as the main win condition rather than muddying the waters, a fault we already highlighted with the 20 Ways To Win deck
You can keep your own graveyard full while your opponent has nothing
, , Sacrifice a Desert: Exile all graveyards
Creature Zombie Snake5/3 At the beginning of each opponent's upkeep, they lose 1 life and you put a -1/-1 counter on up to one target creature they control
Turn it face up any time for its megamorph cost and put a +1/+1 counter on it.) When this creature is turned face up, it deals 1 damage to any target