Re control playing cards dead until turn 4: there are many Yorion piles playing things like Aluren, Primeval Titan, Field of the Dead, Wandering Emperor, Mystic Sanctuary. In an 80-card deck with cantrips the probability of getting flooded with lategame tools early is low. Cutting down to 2 Sanctum may help.
With multiple 2-mana enchantments it's not really "dead" on turn 3. It taps for W like a regular land, casting the 3-mana plays. Then it starts ramping on turn 4 or later. If you play control with Soothsaying then there are even more cheap enablers.
1-2 Terminus may be enough without cutting Trial/Strix. Miracles has run Coatl and Strix before, especially in 80-card. You aren't forced into 3-4x Terminus if the rest of the deck already handles creatures well.