The problem (in Modern anyway) wasn't that one deck was dominating or that a particular card was obviously broken
Yes, for the right person
Vivi Ornitier Rarity: Mythic Rare Card Type: Legendary Creature Wizard Power/Toughness: 0/3 Casting Cost: 1BR Market Value: $46.47 (Regular), $52.47 (Foil) To a lot of players, Vivi is one of the all-time great Izzet spellslinger deck commanders
That said, I don't think any readers here would blame you if you turned a bird in for $200,000 or even $77,000
Purphoros, Bronze-Blooded is also worth consideration for decks that want haste and more creatures to attack with
So, with cards that give you the ability to draw and then discard one, or even when an opponent makes you discard a card, you just get to swing on people for, relatively, free