Guardion Of Serra

when this creature enters the battlefield or transforms, create a 4/4 white angel with flying, lifelink, protection from black and first strike.
Flying, First Strike
{w}: This creature gets +1/+1 until end of turn. It gets an addtional +1/+1 unless any player pays {1}.
when a non-angel creature token enters the battlefield, create a 2/2 white angel with flying and lifelink.
on each upkeep, if no spells where cast last turn, transform this creature.