Earthcraft seems too good to take off the ban list, but Mind Twist is very safe. For a relatively dangerous Mind Twist, too many cards would be needed in the early turns for let's say X = at least 2, but then you'd be better off playing Hymn to Tourach.
Show and Tell isn't that bad to warrant a ban.
I like it, but not main deck. It goes well with an Enlightened Tutor sideboard package.
How about Fervent Denial?