Sivitri Scarzam is a bad Magic card
(To behold a Dragon, choose a Dragon you control or reveal a Dragon card from your hand.) Whenever a Dragon you control enters, put a +1/+1 counter on Sarkhan
Whenever equipped creature attacks, it doesnt untap during its controllers next untap step
In addition to that stellar selection, you can also find Primal Groudon and Primal Kyogre cards here, which sit just behind Rayquaza as the most valuable cards from Ancient Origins
Its been a while since Ive witnessed a real counterspell war over a creature in a Commander game, but Dovins Veto would settle that once and for all
Nissa can make turn four or five Eldrazi happen, and not just the turdy cheap ones, things like Ulamog and Kozilek