Windstorm Drake

Flying
Other creatures you control with flying get +1/+0.

Soulblade Djinn

Flying
Whenever you cast a noncreature spell, creatures you control get +1/+1 until end of turn.

Waterkin Shaman

Whenever a creature you control with flying enters, this creature gets +1/+1 until end of turn.

Sworn Guardian

Unsummon

Return target creature to its owner's hand.

Glint

Target creature you control gets +0/+3 and gains hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.)

Frilled Sea Serpent

{5}{U}{U}: This creature can't be blocked this turn.

Warden of Evos Isle

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

Wall of Runes

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

Cloudkin Seer

Flying
When this creature enters, draw a card.

Winged Words

This spell costs {1} less to cast if you control a creature with flying.
Draw two cards.

Windreader Sphinx

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

Sleep

Tap all creatures target player controls. Those creatures don't untap during that player's next untap step.

Waterknot

Enchant creature
When this Aura enters, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step.

Island

Zephyr Gull

Riddlemaster Sphinx

Flying (This creature can't be blocked except by creatures with flying or reach.)
When this creature enters, you may return target creature an opponent controls to its owner's hand.

Overflowing Insight

River's Favor

Enchant creature
Enchanted creature gets +1/+1.

Octoprophet

When this creature enters, scry 2. (Look at the top two cards of your library, then put any number of them on the bottom and the rest on top in any order.)