Aether

Indestructible
Aether enters the battlefield with two ether
counters on it.
Whenever Aether would be dealt damage,
prevent that damage and remove that many ether
counters from Aether.
As long as Aether has four or more ether
counters on it, creatures you control have lifelink
and vigilance.
If Aether has no ether counters, sacrifice it.
{1}{w}: Put an ether counter on Aether.