yugioh slifer the sky dragon card YGO Obelisk the Tormentor serve up simple strategies to Summon and win with either Slifer the Sky Dragon or Obelisk the Tormentor The Sky Dragon Archetype -

Surge Engine's last ability can be activated only once per game, not once per turn

If I were to choose one, Id go with Desertion, but it's okay to run both in your Talrand, Sky Summoner EDH deck

That may sound cool, but in reality its not so great

Serpents leave their eggs in the cold and inky depths Biolume Serpent Color Indicator: Blue Creature Serpent Sacrifice two Islands: This creature cant be blocked this turn

Moving ahead, Nihilego is definitely going to remain a mainstay in multiple decks

Youll be looking either for a commander that cares about hitting your opponent like Anowon, the Ruin Thief, or something that makes it likely that youll get to hit the opponent with multiple creatures like Oona, Queen of the Fae