The concept is to flood the board with free units from the rat cages and urns, get my Assembly Lines and Scavenge online, then sac them all with Blood Kalis to make massive weapons. Oblivion Spike is also useful because of its synergies with Kalis Torrent of Spiders is preferable dropped after a Kalis to rebuild my board, and can honestly end games on its own of you just keep swinging. And of course you have Smugglers Stash grabs Kalis to replay and usualy grabs rats as my units, which cost 0 and can be played the turn you return them. Its not uncommon for Kallis to become a 40/40 after the first Smugglers Stash.