Evilswarm Ouroboros [HA07-EN065] Secret Rare Ghosts from the Past then if you control "Exosister

then if you control "Exosister Irene"

Destroy that monster and inflict damage to your opponent equal to half its ATK

you can discard this card to reduce the Battle Damage inflicted to your Life Points to 0

Your opponent cannot target this card for attacks or by card effects

Evilswarm Ouroboros [HA07-EN065] Secret Rare Ghosts from the Past then if you control "ExosisterSet: Hidden Arsenal 7: Knight of Stars Card type: Xyz Effect Monster Rarity: Secret Rare Attack: 2750 Defense: 1950 3 Level 4 monsters Once per turn: You can detach 1 Xyz Material from this card to activate 1 of these effects. Each effect can only be used once while this card is face up on the field. Target 1 card your opponent controls; return that target to the hand. Send 1 random card from your opponent's hand to the Graveyard. Target 1 card in