Mothertree

Whenever a creature you control would die, you
may exile it instead. If you do, search your library
for a creature card with mana value equal to the
exiled creature's mana value minus 1.
{5}{g}{g}: Search your library for a creature card
with mana value equal to the number of creature
cards you own in exile.
Death does not exist on Krystavyn. Only old life.