You need ways to sneak Tana past opposing blockers, but red has plenty of effects like Goblin Smuggler to help with that
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
This list includes a mix of Magic the Gathering cards, as well as a few Star Trek the Next Generation cards
Indomitable Creativity (red), Jund (black/red/green), Death's Shadow (black/red/blue), Rakdos Midrange (black/red), and more decks make use of this discard spell to absolutely hose opponents playing burn or other hyper aggressive strategies