Solaris, Daylight Deity

Indestructible
As long as you don't control any other white creatures, Solaris isn't a creature.
Whenever another white permanent enters the battlefield, target creature gains X +1/+1 counters where X is equal to its devotion to white.
{2}{w}{t}: Creatures with +1/+1 counters gain
Lifelink until the end of the turn.