Continuous Whenever your opponent discards a card, draw a card. Continuous Whenever a resonator is put into a graveyard from your opponent's field, put target resonator from your graveyard into your hand.
If Seth, the Arbiter is destroyed or banished at the same time as an opponent's resonator, the ability will still trigger. Seth will be in the graveyard by the time the trigger is added to the chase, so he can add himself back to his owner's hand.