Antimagic Pulse

One pulse go out with a fifth LVL but increases with the lvls, 7th (two pulses), 9th (three pulses). A nat 20 adds one pulse to the attack. Everyone in range has to make their spellcasting stat save for each pulse, on a fail they can't use spells for 1 turns, on a save they ignore it. A nat 20 grants immunity to all antimagic spells for one turn. Caster is immune to their own spell but not others. If casting is interrupted or stopped at anytime before casting, the caster takes all negative effects.