Guardian of the Throne and the Tomb (TOP-076 MR) [Ten Oaths of Protopaterpolis' War]

[Stealth] If a resonator was put into the field under your opponent's control this turn and you control three magic stones. [Mythic] [Eternal] [Enter] or whenever this card deals battle damage >>> Put target resonator card from your graveyard into your standby area face down. W, banish a card in your standby area: You gain 600 life. R1, banish a card in your standby area: If you banished a card with [Ambush] or [Stealth] to pay this ability's activation cost, this card gains [+300/0] and [Multi Strike] until end of turn. This card deals damage equal to its ATK to target resonator you don't control.