Lair Delve

Card advantage with a filter on it, and the filter is exactly where the design lives. The reveal-two structure looks generous until you trace what survives it: only creatures and lands come to hand, while everything else (your instants, your sorceries, your enchantments, the spells you most want to dig toward) goes to the bottom. That makes this a dig that punishes the very decks most interested in raw cards. The cleanest home is a creature-and-land deck that does not care which of the two types it gets, because then the worst outcome is still two cards in hand for the price. The category-restricted draw is an old green pattern: green has long been permitted to refill on creatures and fix on lands while paying a tax for any noncreature spell it wants to touch, and this folds both halves of that permission into a single sorcery. The wrinkle is variance. Reveal two creatures and you have drawn two cards; reveal two of the wrong types and you have spent three mana to send both revealed cards to the bottom and gain nothing tangible. It is a card that wants a deck built so the floor and the ceiling collapse toward each other, where nearly every card is one of the two types it will accept, and the gamble disappears into consistency.