Megalith Unformed (ETCO-EN070) [Eternity Code]

Activate 1 of these effects;
<br>• All monsters your opponent controls lose 500 ATK for each Ritual Monster on the field, until the end of this turn.
<br>• Ritual Summon 1 "Megalith" Ritual Monster from your Deck in Defense Position, by <br>Tributing monsters from your hand or field whose total Levels equal exactly twice its Level.