With the exception of Eye of Ugin, this card can deal with pretty much everything, be it True-Name Nemesis, Liliana of the Veil, or Sylvan Library
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There was another type of card that was removed: Back in the old days, Magic included an ante rule as a way of playing for keeps. That's still an optional rule in casual play, but its strictly forbidden in Tournaments, so cards that involve the ante concept are banned in all formats
Non-signature versions look the same just without the signature
If you keep dropping creatures before you do the flip, the 2 life is already paid for in life gain
If the Jitte leaves the battlefield after the "+2/+2" mode is announced but before it resolves, the bonus when the ability resolves is given to the creature Umezawa's Jitte was attached to when it left the battlefield