Unfortunately, you can't play Composite Golem since its color identity is actually WUBRG because it adds WUBRG to your mana pool and shows the symbols for each.

Thanks bbr15. Corrected with the Nim Deathmantle + Phyrexian Altar + Su-Chi infinite mana combo.

I'd play Exsanguinate over Banefire personally, especially in multiplayer. And since you're going infinite-mana, Staff of Domination is always good, infinite life/untaps/draw your library, etc.

ray2k: Thanks for the comment! Both cards are good calls. I''l have to figure out where to work Staff of Domination in now.

Is there any reason that Nim Deathmantle + Ashnod's Altar + Cathodion isn't just as good as Nim Deathmantle + Phyrexian Altar + Su-Chi ? Other than having a mana of any color obviously.

benjaminpaullarson: I don't see why it wouldn't be just as good for producing colorless mana. I have that combo in here to produce infinite colored mana in case I may need it for any reason (such as bad mana fixing) and most of my other infinite mana combos (which are generally easier to set up) are colorless.