Nevermore, from Innistrad, and its predecessor, Meddling Mage (from way back in Planeshift), are both great cards in tournaments, highly competitive, especially against combo decks that rely on specific cards
Look at that cheeky dodge in Avoid Fate
Interestingly the payoff for accumulating experience with Aang is a bit of a nonbo with the above
We have a stack of Enchantments which deal with problem permanents (basically a bunch of Oblivion Rings), and one board wipe which only kills non-Enchanted Creatures (good ol' Winds of Rath)
This list includes a mix of Magic the Gathering cards, as well as a few Star Trek the Next Generation cards
This will force you into a specific rotation , meaning you'll need to pay close attention to what you're doing for the most optimal setup, more so than some easier characters you can use