Black Lotus costs 3000$ and is restricted in vintage so how in hell u have 4 of them in your deck?
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dark ritual and cabal ritual are good mana accelerators
phage works best in blue black deck. get loads of counterspells to counter killing spells or disables cast on phage and use mana accelerators to get it fast into play, also counterspells give u time until u get phage. also try whispersilk cloak with phage, then its unblockable and has shroud so it cant be killed and u practically won the game...
Put Doubling Season and Paradox Haze to boost your Saproling creation. With those cards and Sporoloth Ancient you will create 2 Saprolings per Thallid each turn!
Add few Nature's Revolt and your opponent will rip his head off, in one turn you will destroy all his creatures and lands.