Cheapest priced copy (Doctor Who): $0.79 at Card Kingdom, near mint, their price list as of .
The Cyber-Controller 
Legendary Artifact Creature — Cyberman · 3/3 · Rare · Doctor Who · #119
When The Cyber-Controller enters, each opponent mills X cards. Put all creature cards milled this way onto the battlefield face down under your control. They're 2/2 Cyberman artifact creatures.
Other artifact creatures you control get +1/+1.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
4 printings · $0.79 to $9.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Doctor Who | 119 | Rare | $0.79 | $3.99 |
| Doctor Who | 405 | Rare | $4.49 | $4.49 |
| Doctor Who | 724 | Rare | — | $7.99 |
| Doctor Who | 996 | Rare | — | $9.99 |
5 rulings from Wizards of the Coast
- 13 October 2023Double-faced permanents that are already on the battlefield can't be turned face down this way. However, a double-faced card can be put onto the battlefield face down from another zone this way.
- 13 October 2023If, for any reason, the face-down creature is turned face up, the effect making it a Cyberman ends. It will be whatever is printed on the card.
- 13 October 2023The player who controls a face-down permanent may look at it at any time. Notably, if the cards were put on the battlefield face down from another player's library, the player that owns them does not get to look at those cards.
- 13 October 2023If the face-down card has a morph ability, its controller may turn it face up by paying the associated morph cost.
- 13 October 2023Each creature turned face down this way or put onto the battlefield this way is a 2/2 Cyberman artifact creature with no name and no color.