Red offers a lot of spot removal to keep the aggro decks at bay, and blue permission spells give you the ability to tango with control and combo decks alike
Rakdos Cackler, aka Racky McCacky, is unexciting but solid, really just in there to ensure the critical mass for aggro decks
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That means that if you exile Flickerwisp with Yorion, the wisp will return next end step exiling Yorion, which will then enter on the next end step exiling wisp, and repeat
However, as we all know this can be unwise in regular EDH - spending all your marbles on a single kill will probably lose you the game in the long run - since the other two players will have more resources than you and will be able to either take you out of the game outright, or at least defend themselves properly
not only is it harder to fake twenty years worth of aging on a Mox, but cards of that caliber are held under a lot more scrutiny