Dragunity Oubliette

When your opponent activates a Spell/Trap Card while you control a "Dragunity" Synchro Monster: Negate the activation, and if you do, banish that card, then if you control a Level 10 "Dragunity" monster, you can have 1 "Dragunity" monster you control gain 100 ATK for each face-up card that is currently banished. You can only activate 1 "Dragunity Oubliette" per turn.