Powerful frontload card that wants you to end fights quickly after playing it. Compare to cards like Offering or Biased Cognition. Very strong if combined with a deck that has good output, or for getting other key cards in play.
Summon 5. Whenever Osty loses HP, ALL enemies lose that much HP as well.
Gain 5 Block. Apply 7 Doom to ALL enemies.
Gain. Draw 2 cards. At the start of your turn, apply 3 Doom to yourself.
Apply 10 Doom, plus an additional 5 Doom for every 10 Doom already on this enemy.
Whenever you play a card this turn, apply 3 Doom to the enemy.