Only 19 cards are tagged on Scryfall with unstoppable, the most recent of which are Zilortha, Apex of Ikoria and Imaryll, Elfhame Elite
The Gaffer's card draw effect happens at the end of every player's turn, making it a great pick for multiplayer Commander games
They are about as far from the natural approach as possible
Finally, the Sapphire and Steel deck focuses on quickly building up a players Inkwell and getting powerful cards that can protect each other onto the playing field
It really speeds up your stuff and is massive ramp that gets better the longer you drop it, but just four or five on turn 2 or 3 when you drop it is still pretty good
Cards like The Queen, Commanding Presence and Gaston, Intellectual Powerhouse are about as tricky as things get, but they simply do what they say on the card and get players used to the powerful (at least in my eyes) shift mechanic, which is a cost reduction method