Warden of Evos Isle

Flying
Creature spells with flying you cast cost {1} less to cast.

Frost Breath

Tap up to two target creatures. Those creatures don't untap during their controller's next untap step.

Tide Skimmer

Flying
Whenever you attack with two or more creatures with flying, draw a card.

Windreader Sphinx

Flying
Whenever a creature with flying attacks, you may draw a card.

Serendib Efreet

Flying
At the beginning of your upkeep, Serendib Efreet deals 1 damage to you.

Roaming Ghostlight

Flying
When Roaming Ghostlight enters, return up to one target non-Spirit creature to its owner's hand.

Wall of Runes

Defender (This creature can't attack.)
When Wall of Runes enters, scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Capture Sphere

Flash (You may cast this spell any time you could cast an instant.)
Enchant creature
When Capture Sphere enters, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step.

Keen Glidemaster

{2}{U}: Target creature gains flying until end of turn.

Unsubstantiate

Return target spell or creature to its owner's hand.

Island

Lofty Denial

Counter target spell unless its controller pays {1}. If you control a creature with flying, counter that spell unless its controller pays {4} instead.

Thriving Isle

Thriving Isle enters tapped. As it enters, choose a color other than blue.
{T}: Add {U} or one mana of the chosen color.