Rauler, The Last Sheiir

Rauler, the Last Sheiir can't be countered.
When Rauler enters the battlefield, search your library for an aura card, put it onto the
battlefield and attach it to Rauler.
Auras attached to Rauler have totem armor.
Exile an aura attached to Rauler: counter target non-creature, non-artifact spell. You lose life equal to the countered spell's converted mana cost.