Conrad, Plague Bringer

: As an additional cost to cast this spell, lose 5 life. At the beginning of your upkeep, each player must sacrifice a creature or lose 3 life.
+2: Create X 1/1 black Rat creature tokens with deathtouch, where X is the amount of life players have lost this turn.
-X: Sacrifice X creatures. Deal X damage to target player and each planeswalker that player controls.