As long as your devotion to white and blue is less than seven, Ephara isn't a creature.
At the beginning of each upkeep, if you had another creature enter the battlefield under your control last turn, draw a card.
Ephara is a value engine that rewards flickering and dropping creatures across all four upkeeps in a turn cycle, drawing you extra cards while you build a board of efficient enters-the-battlefield (ETB) creatures. You play a controlling blink/flash midrange game, develop devotion to flip Ephara into an indestructible attacker, and grind opponents out with card advantage.
Repeatable card draw on every upkeep, including opponents' turns, keeps your hand full
Indestructible body that's hard to remove and contributes lasting board presence
Flash and flicker effects abuse the 'enter the battlefield last turn' trigger easily
Deep, well-supported ETB creature pool in Azorius colors
Needs another creature to enter every turn or the draw engine sputters
Devotion to flip into a creature is inconsistent without enchantment/permanent density
Slow to close games and can be out-tempoed by dedicated combo or aggro
Wraths reset your board and your devotion, neutering Ephara as a creature
Reanimates key creatures and is itself a flicker target for repeated value.
Add more reliable flicker engines (Conjurer's Closet, Eldrava-style loops) and ETB payoffs like Cloudblazer and Mulldrifter to convert blinks into card advantage. Tighten the curve with strong tutors and protect Ephara's engine via counterspells and free interaction (Swords to Plowshares, Mana Drain). For a higher ceiling, build toward a flicker combo with Deadeye Navigator plus a value or damage outlet to close games before grindy boards stall.