Cockatrice

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

Serra Angel

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

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.

Dancing Scimitar

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

Sengir Vampire

Flying (This creature can’t be blocked except by creatures with flying or reach.)
Whenever a creature dealt damage by Sengir Vampire this turn dies, put a +1/+1 counter on Sengir Vampire.

Bog Imp

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

Phantasmal Forces

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

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.)

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.)

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.)

Will-o’-the-Wisp

Flying (This creature can’t be blocked except by creatures with flying or reach.)
: Regenerate Will-o’-the-Wisp. (The next time this creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)

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.

Nightmare

Flying (This creature can’t be blocked except by creatures with flying or reach.)
Nightmare’s power and toughness are each equal to the number of Swamps you control.

Junún Efreet

Flying
At the beginning of your upkeep, sacrifice Junún Efreet unless you pay .

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.

Will-o’-the-Wisp

Flying (This creature can’t be blocked except by creatures with flying or reach.)
: Regenerate Will-o’-the-Wisp. (The next time this creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)