Guardian treasure combined with infinite cards is a way to quickly power up slifer. Also mausoleum of the emperor can help you get high level monsters on the field to stall. And the creator can also bring back powerful cards from the graveyard to tribute
Heart of the underdog
Strong level 4 normal monsters. I like fusions lately. Thousand dragon, blue eyes ultimate, skull dragon, red eyes black, time wizard, 2 beastking of the swamp, and 2 blue eyes white. It compliments silfer because you still need 1-4 sacrificial cards, but enterchangable sometimes. Silfer can be special summoned?!?!?
^
Riryoku, 3 Aroma Garden, Infinite Cards, Gift of the Martyr, Spell Vanishing (weird choice since it's extremely unneeded in this deck), and 2 Riryoku Field.
It's not even the best Osiris deck btw, Aromage fit Ra more, not Osiris