Considering that you can activate his ability as many times as you have green mana to pay, this is a pretty powerful card. It's especially good if your opponent isn't playing any green mana sources. On top of that, it's a 3/3 flyer for 2GG.
It's not hard to see why this is on the Reserve List, as it's actually quite powerful on paper. In practice, the Ifh-Biff Efreet doesn't really see much play anymore. He does pop up in Cubes and Commander decks, here and there. At $100 or more a pop, though, he's becoming a pricey Old School Magic card.
Have you ever played Ifh-Biff Efreet?
~ Phoenix <3