Wikia

Original	First Errata
You cannot Normal Summon this monster. This card can only be Special Summoned by offering "Labyrinth Wall" equipped with "Magical Labyrinth" as a Tribute. No other Tribute Monsters are necessary.	This card cannot be Normal Summoned or Set. This card can only be Special Summoned by Tributing "Labyrinth Wall" equipped with "Magical Labyrinth".
MRL-056 Magic Ruler Added by Glittersword	SRL-EN056 Spell Ruler Added by TwoTailedFox

Card Errata:Wall Shadow