Lets do a little Prototype lightning round of the better examples to kick things off: Autonomous Assembler Likely better in multiples, which doesnt really do much for us here in Commanderland outside of goofball Assembly-Worker decks
Brokkos, Apex of Forever As long as you have a non-human creature on the battlefield, Brokkos, Apex of Forever cant die (although it can be exiled sometimes)
One thing to note is that the lessons can also be part of your main deck
Its hard to recover if your opponent plays two of these
Building your deck can be challenging, but there's no reason you have to do it painfully, card by card
The rapidly accumulating card advantage alongside dealing extra damage each time a ninja you control connects in combat can quickly snowball games, especially when a 1-drop gets through unchecked on turn 2