PSY-Frame Circuit (HSRD-EN036) [High-Speed Riders]

If a "PSY-Frame" monster(s) is Special Summoned to your side of the field (except during the Damage Step), you can: Immediately after this effect resolves, Synchro Summon 1 Synchro Monster, using only "PSY-Frame" monsters you control. At the start of the Damage Step, if a "PSY-Frame" monster you control battles an opponent's monster: You can discard 1 "PSY-Frame" monster; that monster you control gains ATK equal to the discarded monster's ATK until the end of this turn.