When you are under the effect of a spell, you transfer it to a creature you touch. If the creature is unwilling, it must make a Dexterity saving throw. On a failure, you transfer the effects of all spells of 2nd level or lower to the target, and you lose those effects. On a success, the spell fails and you retain the effects.
Regardless of their original duration, the spell(s) last for 1 minute for the target, before What's Mine is Yours ends and the effects fade.
At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, you transfer the effects to the target of spells of levels equal to or less than the level of the spell slot you used, and you lose them.
You create a glowing mote of energy that hovers above you for the duration. The mote sheds Bright Light in a 5-foot radius and Dim Light for an additional 5 feet.
When you cast this spell and as a Bonus Action on later turns, you can unleash a shining bolt from the mote, targeting one creature within 120 feet of yourself. Make a ranged spell attack. On a hit, the target takes Force or Radiant damage (your choice) equal to 4d10 plus your spellcasting ability modifier.
In addition, while the mote is present, you have Three-Quarters Cover, and if you succeed on a saving throw against a spell of level 7 or lower that targeted only you and didn't create an area of effect, you can take a Reaction to deflect that spell back at the spell's caster, the caster makes a saving throw against that spell using that caster's own spell save DC.
You invoke both death and life upon a 10-foot-radius sphere centered on a point within range. Each creature of your choice in that area must make a Constitution saving throw, taking 2d6 necrotic damage on a failed save, or half as much damage on a successful one. Nonmagical vegetation in that area withers.
In addition, one creature of your choice in that area can spend and roll one of its unspent Hit Dice and regain a number of hit points equal to the roll plus your spellcasting ability modifier.
At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d6 for each slot above the 2nd, and the number of Hit Dice that can be spent and added to the healing roll increases by one for each slot above 2nd.