Belecoth, the Green Dragon

Indestructible
When Belecoth, the Green Dragon enters the battlefield, exile target creature.
{8}{g}: Summon a Legendary Creature token named "The Green Dragon" with flying, haste, trample, ward - sacrifice a legendary permanent and has power and toughness 13/9 .
Whenever the The Green Dragon leaves the battlefield, sacrifice "Belecoth the Green Dragon".