Skull Storm [Commander 2018] XY20 and not during the Damage

and not during the Damage Step

Special Summon 1 Level 3 Normal Monster from your hand or Deck

Set: Battle Pack 3: Monster League Card type: Continuous Spell Rarity: Shatterfoil Rare Attack: 0 Defense: 0 When a Psychic-Type monster is Normal Summoned: You can pay 500 LP

whose DEF is higher than its ATK

but it is destroyed at the end of this Damage Step

Skull Storm [Commander 2018] XY20 and not during the DamageSet: Commander 2018 Type: Sorcery Rarity: Rare Cost: {7}{B}{B} When you cast this spell, copy it for each time you've cast your commander from the command zone this game. Each opponent sacrifices a creature. Each opponent who can't loses half their life, rounded up. A rapid and catastrophic decline.