This lets you fix your mana, largely due to our next entry
Kadena is quite powerful too, gifting you a free morph spell each turn and giving you card advantage whenever you turn your creatures face-up
If you're sticking to the Vampire Aristocrats theme then the first cards I'd pick up would be Vampiric Tutor (finds Skullclamp and has Vampire in it!), Bloodletter of Aclazotz which doubles your drain / damage output on your turn absolutely wild, Bloodline Keeper provides sac fodder and a strong anthem, Legion's Landing nice thematic ramp, and Sorin, Imperious Bloodlord thematic ramp and removal
This card is the heart of the Hammer Time archetype in Modern, and for good reasons
A boost of three mana, or one mana on the turn you play the Monolith, is far too dangerous to be allowed to survive
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