Abyssion, Lord of the Void

Indestructible. Deathtouch. Flying.
When Abyssion is played, you may pay {x} mana,
for each mana spent, destroy a permanent.
Every round Abyssion is active, you must pay 4
life or sacrifice a land, if you can't, {t} him.
If you cannot pay 4 life or a land again
the next turn, banish Abyssion.
When Abyssion is destroyed, banish him.
Nothing is more terrifying than the void.