Quirky secret commanders? For underplayed cards?

What are some quirky "secret commanders" to build around that enable some really unusual strategies and allow a deck to run a bunch of underplayed cards?

Some good examples of what I'm looking for are cards like [[spy kit]] that enables cards like [[mask of the mimic]] and the other "same name" cards which never see play in commander.

Or how [[tainted remedy]] can make an [[alms beast]] laughably playable in a deck filled with stuff to make opponents gain life.

Unusual cards that make bad cards good?