Basalt Monolith + Grim Monolith Basalt Monolith and Grim Monolith are kind of like rituals in that they deliver a burst of mana for one turn, but the option to untap them makes them significantly stronger
Some very strong cards, including Thassa's Oracle (one of cEDH's staple wincons), are impulse effects
Urzas Command Urza's Command is an extremely strong command in the right deck
Your best bet is to either pair them with cards like Start Your Engines to enable large attacks, or play them alongside cards like Urza, Lord High Artificer or Daretti, Scrap Savant that become stronger just from having extra trinkets lying around
Legendary Creature - Demon Commander (CTRL to add secondary) combos combos (CTRL to add secondary) Copy Copy (CTRL to add secondary) Creature Creature (CTRL to add secondary) Discard Discard (CTRL to add secondary) Drain Marionette Apprentice Fabricate 1 (When this creature enters, put a +1/+1 counter on it or create a 1/1 colorless Servo artifact creature token.) Whenever another creature or artifact you control is put into a graveyard from the battlefield, each opponent loses 1 life
Its not inconceivable that a deck with graveyard or madness synergies could want this out of the sideboard, but its not likely