You can use the (1)st effect with this card’s name only once per turn.
(1) When either player activates a monster effect on the field: You can have the activating player toss 1 coin and call it. If they call it right, send this card to the GY. If they call it wrong, negate that activation, and if you do, that player gives control of that monster to their opponent.
Atom 1.0
