Freezeswapper is a great addition as neither swap nor freeze are really super helpful in most matches, however being able to do both at once would allow for a more strategic focus centered around freeze rather than just stalling.
Poisonswapper could be a bit too strong as poison is already a super useful ability so to be able to poison the enemy and get in a position to threaten at the same time might cause balance issues.
Meteor swapper is even more useless than normal meteor attack is, because it only really works if you can guarantee the unit won't move which is even harder to do if you have to swap with them first.
Compelswapper is unclear as to what it does and is likely to confuse everyone so it automatically sucks until the ability gets more details like which enemy, where does it move, etc.
Overall poisonswapper is strongest, followed by freezeswapper, followed by meteorswapper, and compelswapper is disqualified for sorcerizing itself.