Wild Cantor is there to support the black. Especially when you lack Land Grant--> Bayou option you really do need a way to find the black consistently.

Yes normally I'd agree that the problem is you don't really have enough mana to play and activate. But the rituals that this lists runs are insane. Each add a net of +2 while Culling adds +3. Also, keep in mind that spare Spoils and Plunges can find you mana sources.

I admit though that its a theoretical list. I was just entertaining the idea of a list that ran Pacts instead of Land Grant.