Imagine having a spectator freely select any card (no force)
It'd have to basically be in a deck that's about +1/+1 counters, or artifact creatures, like modular, but there's also ways to make those multiply really quickly
It is impossible think to defeat the opponent just using "mill sources", you have to think to some alternatives: you can do that with a lot of order, and you must not need luck in order to win , every hand should be the ideal hand
You can obtain them by opening booster packs using Pack Hourglasses
Also in the top ten are Pyroclasm, Galvanic Blast, Anger of the Gods, Kolaghan's Command, and Terminate, which are all blanks
Any "as [this] enters the battlefield" or "[this] enters the battlefield with" abilities of the chosen permanent will also work