Form of the Dragon

{4}{R}{R}{R} · Enchantment

At the beginning of your upkeep, this enchantment deals 5 damage to any target. At the beginning of each end step, your life total becomes 5. Creatures without flying can't attack you.

Motor: se resuelve a mano

Rulings (3)

Unless some effect explicitly says otherwise, a creature that can’t attack you can still attack a planeswalker you control.
Wizards of the Coast · 2014-02-01
If you life total was above 5 at end of turn, then you lose life to make your total 5. If it was less than 5, you gain life to bring it to 5.
Wizards of the Coast · 2004-10-04
It sets your life total at the beginning of the end step of every player’s turn, not just your own.
Wizards of the Coast · 2004-10-04