When Cyclops Electromancer enters the battlefield, it deals X damage to target creature an opponent controls, where X is the number of instant and sorcery cards in your graveyard.
A split card that’s both an instant and a sorcery is counted only once for Cyclops Electromancer’s ability.
The number of instant and sorcery cards in your graveyard is counted only as Cyclops Electromancer’s ability resolves.