Shadowverse

The Rune faction had a Mud Alchemist, healing for 5.

Well, that's true. But it's a Mud Alchemist, it's generally for defense, and it's not like this heal could compete with the beast, I'd say.

The Dungeon faction has Khavy, who can easily heal for 13-15 if he's lucky.

Yes, if he's lucky. Often, Khavy can be neutralized before he has a chance to heal, or he can be dealt a minimum amount of damage, 2-3 HP, which isn't very significant (though, combined with a Ward and a Destroyer, it becomes quite effective). And now, the Dragon has a new ban...