When Cabaretti Courtyard enters the battlefield, sacrifice it. When you do, search your library for a basic Mountain, Forest, or Plains card, put it onto the battlefield tapped, then shuffle and you gain 1 life.

When Crosis's Catacombs enters the battlefield, sacrifice it unless you return a non-Lair land you control to its owner's hand.

: Add , , or .

Dungeon Descent enters the battlefield tapped.

: Add .

, , Tap an untapped legendary creature you control: Venture into the dungeon. Activate only as a sorcery. (Enter the first room or advance to the next room.)

Forsaken Crossroads enters the battlefield tapped.

As Forsaken Crossroads enters the battlefield, choose a color.

When Forsaken Crossroads enters the battlefield, scry 1. If you weren't the starting player, you may untap Forsaken Crossroads instead.

: Add one mana of the chosen color.

Return up to two target creatures to their owners' hands. Scry 1. The Ring tempts you.

Put target nonland historic permanent into its owner's library fourth from the top. (Artifacts, legendaries, and Sagas are historic.)

Choose one. If you descended this turn, you may choose both instead. (You descended if a permanent card was put into your graveyard from anywhere.)

• Destroy target creature or planeswalker.

• Destroy target noncreature, nonland permanent with mana value 1 or less.

Destroy target artifact or enchantment. You gain 3 life.

Exile all creatures. Incubate X, where X is the number of creatures exiled this way. (Create an Incubator token with X +1/+1 counters on it and ": Transform this artifact." It transforms into a 0/0 Phyrexian artifact creature.)

: Add .

: Add one mana of any color. Spend this mana only to cast Phyrexian creature spells.

Corrupted — : Target 1/1 creature gets +2/+1 until end of turn. Activate only if an opponent has three or more poison counters.