Dueling Counterspell

A different kind spell countering where instead of interrupting a spells casting, you meet a spell with the power of your own. This spell works as follows:

• When you cast this spell you will choose a spell that you know using that spell as your counter (this doesn't use an extra spell slot, it is part of this spell).
• The spell chosen must match the power and function of the spell you are countering in order for the spell to work (EX: fireball vs lightning bolt, detect thoughts vs physic lance, or charm person vs suggestion). 
• Both spell casters will roll opposing spell attacks to see which spell wins out (DM Discretion: rolling a NAT 20 during this check can make the winning spell do critical damage).
• If the target wins the duel, they can either keep the course of their spell; or use their reaction to change the target of the spell to you if you weren't already the target. 
• The loser of the duel takes the full damage of the spell and is treated as an auto-hit or failed save. 

(DM Discretion: you can have the range of this spell stay at 60ft, or have it match the range of the spell chosen for the counter.)

Higher Levels: When casting this spell at a higher level you can use the higher level effects of the spell you have chosen to use for the counter. 

Thank you to The Dungeon Coach for inspiring this spell idea!