Flying

When Balduvian Horde enters the battlefield, sacrifice it unless you discard a card at random.

Trample (This creature can deal excess combat damage to the player or planeswalker it’s attacking.)

Haste (This creature can attack and {T} as soon as it comes under your control.)

At the beginning of the end step, sacrifice Ball Lightning.

Flying

{3}{U}: Untap Blizzard Elemental.

Bloodrock Cyclops attacks each combat if able.

Put any number of target creature cards from your graveyard on top of your library.

Draw a card at the beginning of the next turn’s upkeep.

Draw three cards, then put two cards from your hand on top of your library in any order.

Flying

Clockwork Avian enters the battlefield 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.

{X}, {T}: 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.

Clockwork Beast enters the battlefield with seven +1/+0 counters on it.

At end of combat, if Clockwork Beast attacked or blocked this combat, remove a +1/+0 counter from it.

{X}, {T}: Put up to X +1/+0 counters on Clockwork Beast. This ability can’t cause the total number of +1/+0 counters on Clockwork Beast to be greater than seven. Activate only during your upkeep.

Flying

Cloud Djinn can block only creatures with flying.

Flying

Cloud Elemental can block only creatures with flying.

Target opponent reveals their hand. You choose a card from it. That player discards that card.

Counter target spell.

Whenever Crashing Boars attacks, defending player chooses an untapped creature they control. That creature blocks Crashing Boars this turn if able.

Trample

Add {B}{B}{B}.

Shroud (This creature can’t be the target of spells or abilities.)

Destroy target tapped creature.

Target player sacrifices a creature.

Look at the top five cards of your library. Put one of them into your hand and the rest on top of your library in any order.