Windfall

Each player discards their hand, then draws cards equal to the greatest number of cards a player discarded this way.

Cloudkin Seer

Flying
When Cloudkin Seer enters, draw a card.

Loyal Drake

Flying
Lieutenant — At the beginning of combat on your turn, if you control your commander, draw a card.

Donal, Herald of Wings

Whenever you cast a nonlegendary creature spell with flying, you may copy it, except the copy is a 1/1 Spirit in addition to its other types. Do this only once each turn. (The copy becomes a token.)

Curiosity Crafter

Flying
You have no maximum hand size.
Whenever a creature token you control deals combat damage to a player, draw a card.

Windreader Sphinx

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

Tome Raider

Flying
When Tome Raider enters, draw a card.

Tide Skimmer

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

Winged Words

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

Mulldrifter

Flying
When Mulldrifter enters, draw two cards.
Evoke {2}{U} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)