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For my tastes, as guidelines I think are worth sticking to, a keyword mechanic needs to be doing offloading in the rules text that makes things more convenient , it needs to have human-understandable reminder text that isnt just the rules text written out, and it needs to be something that other things can usefully reference

(3/19/2021) If a token is exiled this way, it will cease to exist and won't return to the battlefield.

Words like Revelation often signify card draw in Magic: The Gathering, so this could be a new two-mana black draw spell

It's a flexible instant-speed way to protect your artifacts / creatures / enchantments from removal, or just temporarily remove your opponents' stuff

Arcane Denial Speaking of old cards, I still have a good few that people just don't have love for

With normal twists however it is a judgement call