Evolving Leyline

Whenever a basic land enters the battlefield,
Evolving Leyline becomes the color of that land
type with the designated effect.
{w}At the beginning of your end step, create a 2/2
white Bird creature token with flying and lifelink.
{u}Whenever you cast a spell, Scry 2. Draw a card.
{b}At the beginning of your upkeep, sacrifice a
nonland permanent.
{r}Attacking creatures have +1/+1 and first strike.
{g}Creatures have "{t}: It fights target creature."