Healing itself? Simple...
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1. Create a new common event.
2. Add new event, Page 3, 8 down on the right is Damage Dealing.
3. Select all party members, and put the damage dealt as '-1'
4. Add a wait command for, 5 frames, or whatever you want.
5. Add a loop command, 9th down, 1st page, on the left.
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Simple?