Master of Oz? St. Joan? Um...
Actually, if you want to fully maximize Future Fusion, take a look at the monsters you can fetch with it and then bring out on the same turn with another card:
Chimeratech Overdragon, Gatling Dragon, Labyrinth Tank - Overload Fusion
Blue-Eyes Ultimate Dragon, B. Skull Dragon, King Dragun, Gaia the Dragon Champion, Thousand Dragon, Fiend Skull Dragon, Darkfire Dragon - Dragon's Mirror
All of the E-Hero Fusions - Miracle Fusion.
2 Card Combo to get any of those out and with the exception of Chimeratech Overdragon, if nothing is done about Future Fusion, a 2nd one will hit the field 2 turns later. That's how you can fully abuse the card. And if Future Fusion gets destroyed or whatnot, Magician of Faith or A Feather of the Phoenix back so you get get it same/next turn and wash, rinse, repeat.