How about you use Alms Beast to buy time to get to Treasury Thrull (and leave back the 6/6) and now use Treasury Thrull as a kind of jerkier Ophidian
It always taps for mana, at least colorless
There is also the Extort ability on Tithe Drinker
Of the Black Theros: Beyond Death creatures, the combination Red-Black elder giant Kroxa, Titan of Deaths Hunger, was particularly epic to lay down

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(8/23/2016) A conspiracy doesn't count as a card in your deck for purposes of meeting minimum deck size requirements