Royal Keeper

Level 4 EARTH/Zombie Effect
1600 ATK / 1700 DEF

Once per turn, you can flip this card into face-down Defense Position. When this card is flipped face-up, it gains 300 ATK and DEF until the end of the turn. (If attacked, this effect resolves after damage calculation.)

Rulings – Yugipedia

Printings:

Pharaonic Guardian: PGD-018 (Common) - 2003-07-18
Dark Beginning 2: DB2-EN218 (Common) - 2005-07-27
Zombie World Structure Deck: SDZW-EN006 (Common) - 2008-10-21

Prices:

Cardmarket: 0.12 €
TCGplayer: $ 0.17