Hallo, the Spirit of Tricks

Level 4 DARK/Fiend Effect
0 ATK / 0 DEF

If this card is Normal or Special Summoned: You can activate this effect; if you still control this face-up card, your opponent chooses 1 of these effects for you to apply.
● This card gains 800 ATK for each Fiend monster currently in your GY.
● Inflict 500 damage to your opponent for each Fiend monster in your GY.
If this card is destroyed by battle or card effect: You can send 1 monster your opponent controls to the GY.
You can only use each effect of "Hallo, the Spirit of Tricks" once per turn.

Rulings – Yugipedia

Printings:

Supreme Darkness: SUDA-EN026 (Common) - 2025-01-23

Prices:

Cardmarket: 0.03 €
TCGplayer: $ 0.06