Melffy Mommy

Level 2 EARTH/Beast Xyz Effect
1000 ATK / 1000 DEF

2+ Level 2 Beast monsters
Once per turn (Quick Effect): You can attach 1 Beast monster from your hand or face-up field to this card as material. This card gains effects based on the number of materials attached to it.
● 3+: Cannot be destroyed by battle.
● 4+: You take no damage from battles involving this card.
● 5+: When an attack is declared involving this card and an Attack Position monster: You can inflict damage to your opponent equal to that Attack Position monster's ATK.

Rulings – Yugipedia

Printings:

Rise of the Duelist: ROTD-EN045 (Common) - 2020-08-06
OTS Tournament Pack 15: OP15-EN011 (Super Rare) - 2021-02-17
OTS Tournament Pack 15 (POR): OP15-PT011 (Super Rare) - 2021-02-18
2021 Tin of Ancient Battles: MP21-EN130 (Common) - 2021-09-30

Prices:

Cardmarket: 0.11 €
TCGplayer: $ 0.16