You can only Special Summon with the way in this card name’s 1st effect once per turn. You can only use this card name’s 2nd effect once per turn.
(1) If you control a Level 2 or lower monster, you can Special Summon this card (from your hand) in Defense Position.
(2) When an opponent’s monster declares an attack: You can banish this card from your GY, then target 1 card you control; negate the attack, and if you do, destroy that target.
Atom 1.0
