Elf Wintershade

Exploit (When this creature enters the battlefield,
you may sacrifice a creature.)
Other Elf creatures you control
get +1/+1
Whenever you cast a creature spell,
each opponent loses 1 life and you
gain 1 life.
When Elf Wintershade exploits
a creature, you may search your library
for a card, put it on top of your library, then
gain 1 life.