Obelisk the Tormentor can't be countered.

Trample, shroud, menace

Whenever Obelisk the Tormentor attacks, destroy target nonland permanent. Put +1/+1 counters on Obelisk the Tormentor equal to its converted mana cost until the end of turn.

{3}: Destroy an additional target nonland permanent with the attack trigger and same effect on Obelisk the Tormentor.