Elden Beast

Vigilance, Reach
Bestow - {4}{p/w}{p/w}
When Elden Beast enters the battlefield, gain:
"When creatures you control deal damage, gain that
much life, doubled".
Elden Beast cannot be exiled. If it would be
destroyed, instead it phases out until the next end
step.
Enchanted creature gains +8/+8, Vigilance, Reach,
and Trample. If the enchanted creature would leave
the battlefield, Elden beast becomes a creature.