Elastic Exchange

You clap your hands together and exchange places with a creature within range. The target entity can be no smaller than one size below yours, and no bigger than one size larger than yourself. If that target is hostile or for some reason would try to resist this spell effect, they can make a constitution saving throw equal to your spell DC. If they succeed, this spell has no effect and the target is aware that the spell was cast, as well as the general location of the caster. If the target is unaware of the user, this save is made at disadvantage. Upon a failure, you and the target creature exchange places. This does not provoke reactions such as opportunity attacks.

If the target would not resist the effect, no save is required.

If you are grappled or restrained, you must succeed a dexterity check to be able to cast this spell (Grappled DC 12, Restrained DC 16).

At Higher Levels: You may choose from the following effects, with one choice per level upcast:

• You may cast this spell as a reaction. If used as a reaction, creatures that attempt to resist the effect have advantage
• The target of this spell must make it's saving throw at disadvantage
• If you are grappled/restrained: You make your dexterity saving throw with advantage 
• You may extend the range of this spell by 30 feet