Daybreak Chimera

This spell costs {X} less to cast, where X is your devotion to white. (Each {W} in the mana costs of permanents you control counts toward your devotion to white.)
Flying

Elspeth, Undaunted Hero

+2: Put a +1/+1 counter on each of up to two target creatures.
−2: Search your library and/or graveyard for a card named Sunlit Hoplite and put it onto the battlefield. If you search your library this way, shuffle.
−8: Until end of turn, creatures you control gain flying and get +X/+X, where X is your devotion to white.

Taranika, Akroan Veteran

Vigilance
Whenever Taranika attacks, untap another target creature you control. Until end of turn, that creature has base power and toughness 4/4 and gains indestructible.

Archon of Falling Stars

Flying
When this creature dies, you may return target enchantment card from your graveyard to the battlefield.

Phalanx Tactics

Target creature you control gets +2/+1 until end of turn. Each other creature you control gets +1/+1 until end of turn.

Daxos, Blessed by the Sun

Daxos's toughness is equal to your devotion to white. (Each {W} in the mana costs of permanents you control counts toward your devotion to white.)
Whenever another creature you control enters or dies, you gain 1 life.

Leonin of the Lost Pride

When this creature dies, exile target card from an opponent's graveyard.

Indomitable Will

Flash (You may cast this spell any time you could cast an instant.)
Enchant creature
Enchanted creature gets +1/+2.

Elspeth's Devotee

When this creature enters, you may search your library and/or graveyard for a card named Elspeth, Undaunted Hero, reveal it, and put it into your hand. If you search your library this way, shuffle.

Plains

Dreadful Apathy

Enchant creature
Enchanted creature can't attack or block.
{2}{W}: Exile enchanted creature.

Sunlit Hoplite

During your turn, this creature has first strike.
This creature gets +1/+0 as long as you control an Elspeth planeswalker.

Karametra's Blessing

Target creature gets +2/+2 until end of turn. If it's an enchanted creature or enchantment creature, it also gains hexproof and indestructible until end of turn. (It can't be the target of spells or abilities your opponents control. Damage and effects that say "destroy" don't destroy it.)

Eidolon of Inspiration

At the beginning of combat on your turn, target creature you control gets +2/+0 until end of turn.

Hero of the Winds

Flying
Whenever you cast a spell that targets this creature, creatures you control get +1/+0 until end of turn.