Surge Conductor Surge Conductor is a very solid proliferate entry given that many artifacts already have counters to proliferate, from Everflowing Chalice to the modular artifact creatures
There are also decks where you actually want artifacts in the graveyard for cards like Goblin Welder for which Thirst becomes one of the very best cards
Black (and red to a lesser extent) have incredible discard-based mechanics that can help take advantage of Chainers ability
I run 3 and 3 because I usually get what I need when I need it and VS Seeker can provide a fourth of either, while freeing up a space in the deck
(It's an artifact with ", , Sacrifice this token: You gain 3 life.") Animal May-Ham Other Spiders, Boars, Bats, Bears, Birds, Cats, Dogs, Frogs, Jackals, Lizards, Mice, Otters, Rabbits, Raccoons, Rats, Squirrels, Turtles, and Wolves you control get +1/+1
The trick here is keeping a whole library on your head without dropping it headwear might be a good approach