So I heard you guys liked to get lots of money, and while beating Osiris with a normal FG deck can sometimes be fun and whatnot, beating him with a specific deck, even if it is not a deckouter, can be incredibly boring. The point was not to have a 100% win rate against him, it was to add some challenge to that (while achieving some payoff for the effort). Therefore, this was born:
6rn 6rn 6rn 6rn 6rn 744 744 744 744 744 744 748 748 748 749 749 749 778 778 778 778 778 778 778 778 778 778 77c 77c 77f 77f 77f 77k 77k 77k 77k 77k 77k 7q4 7q4 7q4 7q4 7q4 7q4
It has pwned Osiris every single one of the games I tested, and it works unupped (this is the ideal, trainer-made build) with only SoGs upgraded, no dragons and a couple more pillars.
The shield split is for safety, as this is a trio and you could lack the quanta to play your favourite shield (a.k.a. the one in your hand). Rewinds are to cancel momentum creatures, and Dragons are there to de-clog Osiris' hand, freeing it of Rewinds and allowing a faster win as he'll deck sooner (you can also kill him with them on a good draw!). Play your Dragons before Osiris gets to 5 cards left or he'll rewind his own creatures.
If you don't get a 500 Hp deckout/win, either RNG hates you or you are doing it wrong.