Bahamut's Boon

As Bahamut's Boon enters the battlefield, choose a creature type.
{1}{w}: Put a divinity counter on target creature you control of the chosen type.
Each creature you control with a divinity counter on it has indestructible.
Those who hear his call meditate for a full day and night, their head filled with reminders of all they are giving up. If they elect to go on they emerge as a dragonborn, a noble, draconic, platinum-scaled version of their previous shape.