Ghostrick Mansion

Field Spell

Monsters cannot attack face-down Defense Position monsters, but can attack directly if all monsters their opponent controls are face-down Defense Position. All effect damage, and battle damage inflicted by monsters other than "Ghostrick" monsters, is halved.

Rulings – Yugipedia

Printings:

Shadow Specters: SHSP-EN062 (Common) - 2013-11-08
2014 Mega-Tin Mega Pack: MP14-EN169 (Common) - 2014-08-28

Prices:

Cardmarket: 0.12 €
TCGplayer: $ 0.33