YuGiOh! - Venom Dreadnought

If this card is Tribute Summoned or Special Summoned: You can place 2 "Venom Counters" on face-up monsters your opponent controls. Monsters with Venom Counters lose 500 ATK/DEF for each counter on them. If a monster with a Venom Counter is destroyed by battle or card effect: You can Special Summon this card from your GY (if it was sent there this turn). You can only use each effect of "Venom Dreadnought" once per turn.