Flashback is one of the best mechanics in the game, and I don't even think that's a very subjective opinion
Other cards in the starter deck such as Hades, Lord of the Underworld and Dr
Likely loses out on a pure power-basis, though
Godo, Bandit Warlord FINAL FANTASY: Through the Ages, Rare Limited: 3.5 If you have a couple of pieces of equipment (ideally ones with Hero select), Gilgamesh, Weapon Collector (Godo, Bandit Warlord) is going to do good work for you
You wont always need a board wipe, so you can always cast it for one of the cheaper modes if theres a problem that needs to be dealt with, but I definitely dont mind destroying all tapped creatures for six mana at instant speed