Heliod, God of the Sun Heliod, God of the Sun can only really fit into white devotion builds
The speed boost to mill opponents is likely to help opponents that want cards in their graveyard unless you're turbo charging your other options to churn through opposing libraries alongside this
As for this deck's commander, popular choices include similarly controlling leaders like the Grand Arbiter or more aggressive creatures that seek to put beleaguered opponents out of their misery quickly, like Harbin, Vanguard AviatorHarbin, Vanguard Aviator, or Raffine, Scheming SeerRaffine, Scheming Seer
Salamence ex has a weakness to Ice and Fairy type attacks, but resistance to Fire and Electric type attacks
One, it wants people to have card-light hands in order to trigger things like The Rack