It didn't lose too much. Cry of Contrition becomes Thoughtseize, Putrefy is easily replaced, and ALL decks lose the RAV bounce/Shock. The only replacements for Bob are Graveborn Muse or Hoarders Greed which are pretty terrible. Anything else would be GG and not viable needing so much B in the deck and running Smallpox to boot. I replaced Confidant with Oona's Prowler, but not sure how it will preform in the long run.

I did what Bardo suggested and came up with the following. I wanted to see what would happen if Saffi were a Bird.

I drew these 20 hands:

*Goyf, Viper, Harbinger, Saffi, Canopy(G+W), Canopy(G+W), Llanowar Wastes(G+B)

-Oblivion Ring, Wastes (G+B), Thoughtseize, Namelesss Inversion, Doran, Thoughtseize, Shriekmaw

***Doran, O-Ring, Saffi, Saffi, NI, Urborg (B), Plains(W)

***NI, Caves(W+B), Viper, Thoughseize, Oring, Saffi, Shreikmaw

**Treetop(G), Gemstone(ALL), Saffi, Goyf, ORing, Goyf, Griffin Guide

*Doran, Viper, Treetop(G), Wastes(G+B), Forest(G), Gemstone(ALL), Wastes(G+B)

*Canopy(G+W), Gemstone(ALL), CAves(W+B), ORing, Saffi, Shreik, Profane Command

**Treetop(G), Urborg(B), Forest(G), Saffi, Doran, HArbinger, Goyf

**Canopy(G+W), Doran, Thoughtseize, GG, Saffi, Thoughtseize, Profane

-Thoughtseize, Viper, Wastes(G+B), NI, Harbinger, GG, NI

*Goyf, GEm(ALL), Swamp(B), NI, Thoughtseize, Viper, Doran

*NI, Viper, CAves(W+B), NI, HArbinger, Thoughtseize, Canopy(W+G)

***Goyf, Forest(G), Viper, Treetop(G), Shreik, Viper, Canopy(G+W)

*GG, HArbinger, Doran, ORing, Thoughtseize, Urborg(B), Canopy(G+W)

**Profane, Oring, GEm(ALL), Vipper, GG, Goyf, Saffi

**Gem(ALL), Viper, Treetop(G), Saffi, Saffi, Profane, Urborg

**Forest(G), Doran, Forest(G), Urborg(B), Saffi, Shreikmaw, Thoughtseize

*Profane, Forest(G), Profane, Shreik, Canopy(G+W), Doran, Caves(W+B)

*Forrest(G), Forest(G), Swamp(B), Caves(G+W), Viper, Shreik, Saffi

-Thoughtseize, Shreik, Viper, Viper, Doran, Oring, Goyf
*I Got GBW in my opening hand
**If Saffi were a Bird I would have had GBW by turn 3
***No difference either way
-One or no lands

So 7-20 or 35% I was able to get my mana in my opening hand or by the next two turns. Had Saffi been a Birds of Paradise that would have theoretically brought my chances up to 14-20 or 70%.

Then I took one single Thoughtseize and replaced it with one Swamp. I made a mark on It to distinguish itself. Of the 20 hands above two of the Thoughtseizes would have been an additional land drawn.

I learned a lot from this.