Sauron, Lord of the Rings

Vigilance, ward — {2}, sacrifice a creature.
When Sauron attacks or blocks, it gets +X/+0 where
X is the greatest power of an Army you control.

Protection from Ring-bearers, Sauron can’t be sacrificed, Ring-bearers can’t cause you to loose life.

At the beginning of combat on each player’s turn,
the Ring tempts that player.

Whenever the Ring tempts a player, scry 1 then
amass orcs 1.