Depth Shark

Level 5 WATER/Fish Effect
1400 ATK / 0 DEF

If you control no monsters, you can Normal Summon this card without Tributing. Once per turn, during your opponent's Standby Phase: This card's ATK becomes double its current ATK until the end of this turn.

Rulings – Yugipedia

Printings:

Duelist Saga: DUSA-EN003 (Ultra Rare) - 2017-03-30

Prices:

Cardmarket: 0.13 €
TCGplayer: $ 0.28