Obelisk the Tormentor

Hexproof
You can cast this card by tributing creatures with a
total mana value of this creature's mana cost.
You can tribute 2 creatures with a total mana value
of 8 or greater, and choose one of the following effects: Destroy all creatures your opponent
controls, and if you do, inflict 20 damage to your
opponent OR put 30 +1/+1 counters on Obelisk
until the end of this turn.
Triad (You can have up to three commanders if
they each have Triad.)