'Undercity' cards

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.