A Keelo deck built around
Oskar, Chief Tinker. Oskar lets these Keelo decks other than the Grazer versions keep board presence, and otherwise fuels your sacrifice effects to rebuy etbs.
Siphoner Paladin and
Jadehorn are a strong combination that give the deck a nice angle in terms of removal (and proccing Rolant).
The entire top end is hidden through
Wasteland Broker so you don't draw them early. Otherwise, they all come in based on matchup. When in doubt just grab Severin.
Chains are:
Blightmoth -> Jadehorn -> 4-drop
Rolant -> Icaria/Severin
Piercing Grief -> Feartracker
etc, etc, deck is great, play it
For the moment I like keeping the top-end in the market, but we'll have to revisit if (when) Broker gets nerfed. Menace has actually been lackluster for me but I've been testing other things.
To reduce the chance that you have keelo but no broker and no interesting transform targets, could put 1-of 5 or 6 cost units in the main deck like Karvet, Redeemed or new Svetya. Extra surge including primal influence if you need it.