So, the card doubles the Levels of the monsters it points to, which enables Ritual Summons to be performed much easier and makes easier to Summon them. Next, if a Ritual Monster is Special Summon (as it, not just Ritual Summoned) to your zone it points to, you get to pick a non-Ritual Monster from your GY and add it to your hand, which makes your Ritual Summons cost-free most of the time, enables you to get back searchers like Manju back and more.
Next, if you want to keep this around, make sure your Ritual Monsters stay in the zones it points to, as having one will provide protection from effects and making it unable to be attacked, and having 2 means it gains 1000 ATK, so you can battle with him as well.
2 Effect Monsters
You cannot Special Summon monsters from your Extra Deck to zones this card points to. Once per turn, if a Ritual Monster(s) is Special Summoned to your zone this card points to: You can target 1 non-Ritual Monster in your GY; add it to your hand. Double the Level of all monsters this card points to. While this card points to a Ritual Monster, it cannot be targeted for an attack or opponent’s card effect, also if it points to 2 Ritual Monsters, it gains 1000 ATK.