Rainbow Kuriboh

Level 1 LIGHT/Fiend Effect
100 ATK / 100 DEF

You can only use each effect of "Rainbow Kuriboh" once per turn.
● When an opponent's monster declares an attack: You can target that attacking monster; equip this card from your hand to that monster. It cannot attack.
● When an opponent's monster declares a direct attack while this card is in your GY: You can Special Summon this card, but banish it when it leaves the field.

Rulings – Yugipedia

Printings:

Legacy of the Valiant: LVAL-EN004 (Secret Rare) - 2014-01-24
2014 Mega-Tin Mega Pack: MP14-EN188 (Secret Rare) - 2014-08-28
Emperor of Darkness Structure Deck: SR01-EN022 (Common) - 2016-01-28
Yu-Gi-Oh! Advent Calendar (2019): AC19-EN010 (Super Rare) - 2019-09-26

Prices:

Cardmarket: 0.32 €
TCGplayer: $ 0.62