Dewloren, Tiger King of the Ice Barrier

Level 6 WATER/Beast Synchro Effect
2000 ATK / 1400 DEF

1 Tuner + 1 or more non-Tuner WATER monsters
Once per turn, you can return any number of face-up cards you control to the owner's hand. For each card returned to the owner's hand by this effect, this card gains 500 ATK until the End Phase.

Rulings – Yugipedia

Printings:

Duel Terminal 2: DT02-EN033 (Duel Terminal Ultra Parallel Rare) - 2010-05-25
Hidden Arsenal 2: HA02-EN027 (Secret Rare) - 2010-07-15
Structure Deck: Freezing Chains: SDFC-EN042 (Ultra Rare) - 2021-02-18
Hidden Arsenal: Chapter 1: HAC1-EN052 (Duel Terminal Ultra Parallel Rare) - 2022-02-24

Prices:

Cardmarket: 0.16 €
TCGplayer: $ 0.19