Cannot be Normal Summoned, unless you control a "Ghostrick" monster. Once per turn: You can change this card to face-down Defense Position. When this card inflicts battle damage to your opponent: You can add 1 "Ghostrick" Spell/Trap Card from your Deck to your hand. You can only use this effect of "Ghostrick Stein" once per turn.
These are the exclusive support cards for Ghostrick monsters. Ghostrick Break can Special Summon 2 different Ghostrick monsters than the ones being destroyed by battle or card effect, from the graveyard to the field in face-down defense position. Ghostrick Scare can change any number of face-down defense mode monsters you control to face-up defense mode, and will also change your opponent’s face-up monsters to face-down defense mode, equal to the number of face-up defense mode monsters you control. Ghostrick Vanish protects all your Ghostrick monsters and face-down defense position monsters from being destroyed by card effects, for 1 turn.
Since “Ghostrick” monsters are relatively weak in terms of ATK and DEF, they would require a substantial amount of support to keep them alive on the field. Mirror wall is not really helpful here since the current meta usually involves high ATK monsters that can hit through your Mirror Wall if you are playing “Ghostrick” themed monsters