aww, I didn't even think about fake formats and now I have to add onesome artifact deck and elves deck stuff from 2010's MTGO 100 card singleton
HONORARY MENTION NUMBER SIX OF MY LIST
When you have to build your entire deck around the payoff, it better be good. And sure, Boomerang wasn't an instant, but they only let you play four Eye of Nowhere, and really, that being a totally accurate sentence about that Standard and later the very brief "MTGO Core Set Only Constructed"* format is everything you need to know.
Magnivore was not the best deck, but it's the exact kind of high I want to chase with every cube build-around. Get this Umori, the Collector nonsense outta here. Hoop has to be jumpable (Lurrus of the Dream-Den) and the power level worth it (and uh... Lurrus of the Dream-Den)
*No, I didn't get to play Eye of Nowhere there. I also didn't know about Ant Queen + Opposition until I had my ass handed to me playing for t8, sb Pyroclasm was not even close to good enough. Stupid 7th edition.