Fog King

Level 7 WATER/Spellcaster Effect
0 ATK / 0 DEF

You can Tribute 1 monster, or no monsters, to Normal Summon (but not Set) this card. The ATK of this card becomes the combined original ATK of the Tributed monsters. Neither player can Tribute cards.

Rulings – Yugipedia

Printings:

Light of Destruction: LODT-EN098 (Secret Rare) - 2008-05-13
War of the Giants Reinforcements: WGRT-EN099 (Ultra Rare) - 2014-01-17
War of the Giants: Round 2: BPW2-EN099 (Ultra Rare) - 2014-01-17
OTS Tournament Pack 2: OP02-EN001 (Ultimate Rare) - 2016-07-15
Speed Duel GX: Duelists of Shadows: SGX3-ENH01 (Common) - 2023-03-30
Speed Duel GX: Duelists of Shadows: SGX3-ENH01 (Secret Rare) - 2023-03-30

Prices:

Cardmarket: 0.24 €
TCGplayer: $ 0.32