Obsessive Pursuit [Avatar: The Last Airbender]

Cost: 1 B When this enchantment enters and at the beginning of your upkeep, you lose 1 life and create a Clue token. (It's an artifact with " 2 , Sacrifice this token: Draw a card.")
Whenever you attack, put X 1/ 1 counters on target attacking creature, where X is the number of permanents you've sacrificed this turn. If X is three or greater, that creature gains lifelink until end of turn.