[Adaptive Automaton] is your colorless sliver lord.Maybe [Metallic Mimic] as a pseudo lord.Also [Mutavault].
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I have tested him on a CoCo slivers mostly as SB against decks like Jund and Grixis, but even there it proved not being that great, it will do nothing against wraths, and it does not trigger on abilities, for which I cutted him out, I think is not good enough to include him since it does not costs 2 mana (I want to cap Vial on 2 counters).What do you think about counters?
It thins the deck, and you dont need 4 forest when you get the same result from an enchanted forest and an Arbor Elf.