Card Guard

Level 4 DARK/Fiend Effect Monster
1600 ATK / 500 DEF

If this card is Normal or Special Summoned: Place 1 Guard Counter on it. This card gains 300 ATK for each Guard Counter on it. Once per turn: You can target 1 other face-up card you control; remove 1 Guard Counter from this card, and if you do, place 1 Guard Counter on that target (if that card would ever be destroyed, remove 1 Guard Counter from it instead).

Rulings – Yugipedia

Printings:

Ancient Prophecy: ANPR-EN085 (Secret Rare) - 2009-09-01
Gates of the Underworld Structure Deck: SDGU-EN021 (Common) - 2011-10-13
Battle Pack: Epic Dawn: BP01-EN162 (Common) - 2012-05-24
Battle Pack: Epic Dawn: BP01-EN162 (Starfoil Rare) - 2012-05-24
Battle Pack 2: War of the Giants: BP02-EN082 (Common) - 2013-06-28
Battle Pack 2: War of the Giants: BP02-EN082 (Mosaic Rare) - 2013-06-28
Battle Pack 3: Monster League: BP03-EN065 (Rare) - 2014-07-31
Battle Pack 3: Monster League: BP03-EN065 (Shatterfoil Rare) - 2014-07-31
Egyptian God Deck: Slifer the Sky Dragon: EGS1-EN011 (Common) - 2021-06-17

Prices:

Cardmarket: 0.06 €
TCGplayer: $ 0.05