Keyword: Flying

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.

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.

Flying (This creature can’t be blocked except by creatures with flying or reach.)
First strike (This creature deals combat damage before creatures without first strike.)
At the beginning of your upkeep, you may sacrifice an artifact. If you don’t, tap Yawgmoth Demon and it deals 2 damage to you.

Flying

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

Flying

Flying
At the beginning of your upkeep, sacrifice a land. If you sacrifice an Island this way, Serendib Djinn deals 3 damage to you.
When you control no lands, sacrifice Serendib Djinn.

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

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

Flying

Flying
: Ifh-Bíff Efreet deals 1 damage to each creature with flying and each player. Any player may activate this ability.

Flying

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

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

Flying

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

Defender (This creature can’t attack.)
Flying

Flying

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

Defender (This creature can’t attack.)
Flying

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

Flying

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.

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