This is a budget, casual planeswalker deck I made real quick around Estrid, the Masked. Estrid's abilities mean we want lots of auras and lots of enchantments.

Abundant Growth and Urban Utopia provide a lot of ramp while also providing the base for most enchantment-counting effects. Estrid's +2 also means you can effectively almost double your mana output. Soul snare and Sphere of Safety also play into this, while providing protection for you and your precious planeswalker.

Creature-wise, Aura Gnarlid and Yavimaya Enchantress form the base of damage output, and are my usual plan to win. Celestial Archon pulls double duty by being a big flyer and also being able to count as a big enchantment.

Otherwise, Helm of the Gods provides a boost to whomever needs it, and the two instants, Swords to Plowshares and Dismantling Blow, are there for a tiny bit of removal.