Warlock Class (AFR) from Adventures in the Forgotten Realms, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Kieran Yanner
• Card Text:
  (Gain the next level as a sorcery to add its ability.)
  
  At the beginning of your end step, if a creature died this turn, each opponent loses 1 life.
  1B: Level 2
  When this Class becomes level 2, look at the top three cards of your library. Put one of them into your hand and the rest into your graveyard.
  6B: Level 3
  At the beginning of your end step, each opponent loses life equal to the life they lost this turn. (Damage causes loss of life.)