Transmute Spell

Once per round you can use your reaction to attempt to transmute another person's spell, if the effects of the spell are within 30 feet of you 

For example, if someone shoots a fire bolt at you, you can attempt to transmute the fire into a flock of pigeons that harmlessly fly away.

Make a spell casting check against the spell casting DC of the original caster. On a success, the spell is transmuted into something of your choosing (subject to the DM's discretion). On a fail, the original spell remains unchanged.

WHEN CAST AT HIGHER LEVELS, you gain a +1 to your spell check for each level above 4th