You can erase 1 card from the game: which?

[Lord Seth]

I'll never forget the day they printed Show and Tell. Made me quit Legacy for 2+ years. Only now does it feel like a stable format again.

At the time of its printing, Show and Tell was only really used for dropping a Dream Halls into play (later used for Yawgmoth's Bargain after it got printed), but Dream Halls and Yawgmoth's Bargain both got banned within a year so I don't know why you took 2 years off.