Brad's Healing Shrooms

A creature of your choice that you can see within range sprouts a somewhat colorful, spectral cluster of mushrooms from its ears, mouth, nostrils, or one of its eyes. The mushrooms have no effect on the creature's senses and only slightly create a minor tint effect when looked into and their color (if they have any) is determined by the caster. At the start of each of the creature's turns, it regains 1d4 hit points. When a creature starts its turn with 0 hit points, the creature instead regains 1d8 hit points and the spell ends immediately. A caster can have up to three instances of this spell at any given time and a creature can only be affected by one instance of this spell at a time. Upon the end of one of the instance's duration, whether fully or premature, all instances of Brad's Healing Shrooms created by the caster end immediately. A caster who does not naturally have access to cantrips can still learn and cast this spell, using a spell slot of 1st level or higher to cast it. If casted in this way, two creatures within range can instead be targeted with each casting of the spell. This spell has no effect on celestials, constructs, or dragons, but causes any plants or undead affected by this spell to regain double the amount of hit points rolled.