You can't enter this dungeon unless you “venture into Undercity”.
Secret Entrance — Search your library for a basic land card, reveal it, put it into your hand, then shuffle (Leads to: Forge, Lost Well)
Forge — Put two +1/+1 counters on target creature. (Leads to: Trap!, Arena)
Lost Well — Scry 2. (Leads to: Arena, Stash)
Trap! — Target player loses 5 life. (Leads to: Archives)
Arena — Goad target creature. (Leads to: Archives, Catacombs)
Stash — Create a Treasure token. (Leads to: Catacombs)
Archives — Draw a card. (Leads to: Throne of the Dead Three)
Catacombs — Create a 4/1 black Skeleton creature token with menace. (Leads to: Throne of the Dead Three)
Throne of the Dead Three — Reveal the top ten cards of your library. Put a creature card from among them onto the battlefield with three +1/+1 counters on it. It gains hexproof until your next turn. Then shuffle.
NM-Mint - $14.30
Lightly Played - $12.90
Moderately Played - $11.40
Heavily Played - $10.00
Damaged - $7.20
NM-Mint Non English - $14.30
Lightly Played Non English - $12.90
Moderately Played Non English - $11.40
Heavily Played Non English - $10.00
Damaged Non English - $7.20