yugioh deck minimum Mimighoul - Dungeon Maker Master Giant Throne are 50 Ultra Rare Cards Main Deck | Yu-Gi-Oh! Wiki

This monster can only be Ritual Summoned with the Ritual Spell Card, "Black Luster Ritual"

But I can confidently say that there would almost definitely be some people who would at least try to sue WotC the moment the reserved list got abolished

That is because your Arid Mesa can point at your Hallowed Fountain, and so can your Misty Rainforest, and you have to draw through some insane percentage of your deck (in a format that sometimes ends on the third turn) before it catches up with you

The mystery experience is random

"Loid" monsters whose original level is 6 or lower can be Normal Summoned without being released

That being said, please let me know if any of these Lairs pique your interest and if you will be getting the entire superdrop or if you will be sticking to singles