Swords to Plowshares is not what you might consider as a life gain card but a good number of games have been saved and then won with the Plowing of your own guy for life, not ideal situations but better than death and all from a card you were playing purely as a removal spell
Its the near-perfect card to reanimate, because youll spend 7-14 life to draw that many cards, and its easy to win from there
Cards like these are exceptionally rare, with the drop rate of these cards averaging out to being just one per three to four cases (though that number will vary from set to set)
Aether Vial is a super potent card that is rather on the dead side if drawn too late
Aragorn and Arwen, Wed can block well with its respectable six toughness, but really shines when you've got a board full of creatures - like many commanders in this MTG color combination
Blightsteel Colossus is one of the scariest creatures around and a popular target for artifact decks to cheat into play