Sid Meier's Ultimate Collection is a bundle that I mostly already own.

Sid Meier's Civilization VI (Owned)

Gathering Storm DLC ($40)
Rise and Fall DLC ($30)
Vikings Scenario Pack ($5)
Poland Civilization & Scenario Pack ($5)
Australia Civilization & Scenario Pack ($5)
Persia and Macedon Civilization & Scenario Pack ($9)
Nubia Civilization & Scenario Pack ($5)
Khmer & Indonesia Double Civilization & Scenario Pack ($9)

Sid Meier's Civilization: Beyond Earth - The Collection (Owned)
Sid Meier's Civilization V: The Complete Edition (Owned)
Sid Meier's Civilization IV: The Complete Edition (Owned)
Sid Meier's Civilization III: Complete (Owned)

Sid Meier's Pirates! (Owned)
Sid Meier's Starships (Owned)
Sid Meier's Railroads! ($10)
Sid Meier's Ace Patrol (Windows)
Sid Meier's Ace Patrol: Pacific Skies (Windows)
Sid Meier's Colonization (Classic) (Owned)
Sid Meier's Covert Action (Classic) (Owned)

So for me the bundle would be for a bunch of Civilization VI DLCs (and there are a lot more DLCs) for $15. I don't know, an incomplete set of DLCs for a game I haven't played yet. Guess I'll pass.