Grief Tablet - Maze of the Master (MZTM)

(This card is always treated as a "Wedju" card.)
The equipped monster cannot attack or be Tributed, also its effects are negated. Once per turn, if you control the equipped monster: You can add 1 "Wedju" card from your Deck to your hand, except "Grief Tablet". If this card is sent to the GY because the equipped monster is destroyed: You can inflict 500 damage to your opponent. You can only activate 1 "Grief Tablet" per turn.