You can Ritual Summon this card with any “Megalith” card.
You can use the (2)nd effect with this card’s name only once per turn.
(1) If this card is Ritual Summoned: You can add 1 “Megalith” Spell/Trap from your Deck to your hand.
(2) During your Main Phase: You can choose 1 Ritual Monster in your hand, and if you do, Tribute other monsters from your hand and/or field, including this card on the field, whose total Levels equal or exceed the chosen monster’s Level, and after that, Ritual Summon the chosen monster.