3 Nethroi, Apex Of Death While Nethroi, Apex of Death is incapable of milling itself, it is a stellar payoff for a mill-heavy deck
It might not be the best card to topdeck while early in the game, but in the mid to late game, when you have a bunch of cards you dont mind exiling from your graveyard, its a cheap way to dig through your deck for just the card you need
Fortuantely, R&D has gotten much more creative with their wording so that there can still be effects like this without the mess of printing a keyword that doesn't actually do anything
Arceus ex is classified as a 4-Diamonds card in the Triumphant Light set
But it eventually stopped showing up, as well as any other cards with similar effects
One anecdote that stood out from this pre-event conversation was the deep explanation given for her decision to include Traptrix Calaria in the Side Deck, all for the potential the card had to play off an opponents Contact C if it ever became necessary