Name:Dungeon Descent
ManaCost:no cost
Types:Land
K:CARDNAME enters the battlefield tapped.
A:AB$ Mana | Cost$ T | Produced$ C | SpellDescription$ Add {C}.
A:AB$ Venture | Cost$ 4 T tapXType<1/Creature.Legendary/legendary creature> | SorcerySpeed$ True | SpellDescription$ Venture into the dungeon. Activate only as a sorcery. (Enter the first room or advance to the next room.)
Oracle:Dungeon Descent enters the battlefield tapped.\n{T}: Add {C}.\n{4}, {T}, 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.)