Spiritmonger

Whenever this creature deals damage to a creature, put a +1/+1 counter on this creature.
{B}: Regenerate this creature.
{G}: This creature becomes the color of your choice until end of turn.

Dominaria Remastered

Whenever Spiritmonger deals damage to a creature, put a +1/+1 counter on Spiritmonger.
{B}: Regenerate Spiritmonger.
{G}: Spiritmonger becomes the color of your choice until end of turn.

Iconic Masters

Vintage Masters

Conspiracy

Spiritmonger can regenerate even if it isn't in combat, it's already tapped, or it's undamaged.

Activating the regeneration ability creates a replacement effect that acts like a shield, replacing the next time Spiritmonger would be destroyed that turn. This shield works against effects that try to destroy Spiritmonger or lethal damage that would be dealt to Spiritmonger.

Spiritmonger's last ability causes it to become only the chosen color. It will no longer be the colors it was previously.

You can activate the regeneration ability even if Spiritmonger isn't at risk of being destroyed.