Archon

Archon can't be put on the battlefield except by its effect.
If Archon is in your library, reveal it to your opponent,
then at any time, you can sacrifice any combination
of 2 High or Dark Templars to put it from your hand, library or graveyard on the battlefield
Protoss Shield 7.
Hexproof
At the beginning of your upkeep, recharge all Protoss shields.