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
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It exiles any number of target creatures then returns them to the battlefield at the start of the next end step
And there's plenty of creatures that untap our creatures efficiently so we can keep convoking, like Plargg, Dean of Chaos, Drumbellower, and White Plume Adventurer
Additionally, were focusing on cards that have multiple copies and sales data records sorry, One Ring fans