Rat

0: At the beginning your upkeep, roll a D6 and then roll another D6. Subtract the first die from the second.
+1: Distribute X life among leaders you control. If the value is negative, subtract that amount of life. X equals the dice total you got this turn.
-X: Reveal cards from your graveyard until you reveal an artifact card that costs X or less. X equals the dice total you got this turn.