I have suggested it for years, and Ive seen others mention it. The creation of a reversal spell. One of the biggest concerns stated is the confusion it would cause during anything over 1 vs 1.
The mechanics are the second wizards casts the spell which stuns the first for one round, after which the caster order reverses. Similar to bubbles this could get tedious if it kept going back and forth. There would be 2 ways to protect it. The first is perhaps using stun blocks. A stun block would negate the spell.
The second would be to make it an extremely rare spell. Not the typical treasure buy card. Make it a high level crafted card or rare boss drop.
It leaves some chance if even slight of the fairness that is sacrificed for a turn based game.
