Rule of Nature {3}{G}{G}
Enchantment
Whenever a creature enters the battlefield under your control, you may have it get +1/+1 until end of turn. If you do, it fights target creature. (Each deals damage equal to its power to the other.)
Details
Legalities
- Rule of Nature is legal in every format.
Rulings
- 2018-09-03 If there are no other creatures and you give a creature +1/+1, it will fight itself, dealing damage equal to twice its power to itself.