The upside of a heavily discounted extra turn doesnt quite make up for the potentially wasted card, but this does good work in decks that manipulate coin flips or can copy it several times over to increase the odds of getting at least one turn out of it
At the beginning of your end step, remove a time counter from it.) Whenever Overlord of the Balemurk enters or attacks, mill four cards, then you may return a non-Avatar creature card or a planeswalker card from your graveyard to your hand.
Like we saw with Mizzix, this is hard to answer since if you kill her, you can recast her, and she is in Cabal Coffers and Rampant Growth colors so you have the mana
Here's a gallery of some of my favorite doctored cards
The flexibility and utility of this box lends itself to pretty much anyone
You can even activate it multiple times