Serra Angel

Flying
Vigilance (Attacking doesn’t cause this creature to tap.)

Dancing Scimitar

Flying (This creature can’t be blocked except by creatures with flying or reach.)

Osai Vultures

Flying
At the beginning of each end step, if a creature died this turn, put a carrion counter on Osai Vultures.
Remove two carrion counters from Osai Vultures: Osai Vultures gets +1/+1 until end of turn.

Clockwork Avian

Flying
Clockwork Avian enters with four +1/+0 counters on it.
At end of combat, if Clockwork Avian attacked or blocked this combat, remove a +1/+0 counter from it.
, : Put up to X +1/+0 counters on Clockwork Avian. This ability can’t cause the total number of +1/+0 counters on Clockwork Avian to be greater than four. Activate only during your upkeep.

Crimson Manticore

Flying
, : Crimson Manticore deals 1 damage to target attacking or blocking creature.

Mesa Pegasus

Flying; banding (Any creatures with banding, and up to one without, can attack in a band. Bands are blocked as a group. If any creatures with banding you control are blocking or being blocked by a creature, you divide that creature’s combat damage, not its controller, among any of the creatures it’s being blocked by or is blocking.)

Mahamoti Djinn

Flying (This creature can’t be blocked except by creatures with flying or reach.)

Cockatrice

Flying
Whenever Cockatrice blocks or becomes blocked by a non-Wall creature, destroy that creature at end of combat.

Lord of the Pit

Flying, trample
At the beginning of your upkeep, sacrifice a creature other than Lord of the Pit. If you can’t, Lord of the Pit deals 7 damage to you.

Hypnotic Specter

Flying
Whenever Hypnotic Specter deals damage to an opponent, that player discards a card at random.

Bog Imp

Flying (This creature can’t be blocked except by creatures with flying or reach.)

Shivan Dragon

Flying
: This creature gets +1/+0 until end of turn.

Wall of Air

Defender, flying (This creature can’t attack, and it can block creatures with flying.)

Vampire Bats

Flying (This creature can’t be blocked except by creatures with flying or reach.)
: Vampire Bats gets +1/+0 until end of turn. Activate no more than twice each turn.

Killer Bees

Flying
: Killer Bees gets +1/+1 until end of turn.

Tetravus

Flying
Tetravus enters with three +1/+1 counters on it.
At the beginning of your upkeep, you may remove any number of +1/+1 counters from Tetravus. If you do, create that many 1/1 colorless Tetravite artifact creature tokens. They each have flying and “This creature can’t be enchanted.”
At the beginning of your upkeep, you may exile any number of tokens created with Tetravus. If you do, put that many +1/+1 counters on Tetravus.

Phantasmal Forces

Flying
At the beginning of your upkeep, sacrifice Phantasmal Forces unless you pay .

Bog Imp

Flying (This creature can’t be blocked except by creatures with flying or reach.)