Runeboggle

House Dimir, Izzet League, and Simic Combine, and Azorius Senate Spell
You attempt to interrupt a creature in the process of casting a spell. If the creature is casting a spell of 4th level or lower, its spell fails and has no effect. If it is casting a spell of 5th level or higher, make an ability check using your spellcasting ability. The DC equals 10 + the spell's level. On a success, the creature's spell fails and has no effect.
On a success, the caster of the countered spell ends their turn immediately. If the countered spell was a reaction from a caster who was casting it on a different creature's turn, the caster of the countered spell cannot cast spells on their next turn.
At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the interrupted spell has no effect if its level is less than or equal to the level of the spell slot you used.

Effect Duration

Instantaneous

Effect Casting Time

Reaction

Range

60 ft

Level

4th