It's a very nice mechanic, as it grants these creatures a lot of flexibility
Milling with Jidoor, Aristocratic Capital has been a dud for me as a wincon because half the deck, even multiple times
Contract of sale 17.1 Subject to the Company's discretion, on the acceptance of a bid by the fall of the Auctioneer's hammer a contract of sale is made between the Seller and the Buyer
Magic the Gathering M15 2015 Core Set expansion
Its one of the simplest, most straightforward effects (just Nope), with a casting cost strict enough to require some deckbuilding concessions if you want to cast it reliably
This seemed like a fine way to go, so we built decks along these lines, and started working on making commanders for them