Time may be very kind (or equally unkind) to Winterspell
Elspeth, Sun's Champion is a very versatile win condition in many Cubes, EDH decks, and some Pioneer decks
While it would be extremely difficult to top the mind-bending original art, it would be a real treat for Magic fans to see Peer into the Abyss re-imagined as an Innistrad card, thanks to all the different genres of horror it could invoke.
Three Steps Ahead Near the top off the heap for counterspells in the last few years is another Cancel
Slots into aggro and does well against control decks that are building options in their hand
Though undoubtedly strong, this card is probably a bit too slow to be main-deckable in Modern: three mana for the sword, two more to actually equip it, and then you have to get through to deal combat damage as well