Poor lands...

[Kuberr]

{Tinker} is banned in legacy. There are so may answers in legacy that didn't warrant legacy bannings.

They got banned in modern because they did not want another age of ravager-affinity which dominated the standard format when mirroden was standard legal. Wizards felt that keeping darksteel citadel was a fair enough trade off. But that's why.

Still banned in modern. All of the artifact lands are legal elsewhere after modern.

[Dstyle1]

{darksteel citadel} is legal in modern.

[Kuberr]

Why is that one legal, but {Seat of the Synod} or {Vault of Whispers} banned?

[Dudecore]

Because its colorless and you can have 4 of them?

[BlackJester]

{Tinker} is legacy restricted. Vintage banned. It's similar to running reanimator decks, but faster and cheaper.

Other way 'round. Restricted in Vintage, banned in Legacy. Legacy is all-or-none, no restricted cards.