Flying

When Abhorrent Overlord enters the battlefield, create a number of 1/1 black Harpy creature tokens with flying equal to your devotion to black. (Each {B} in the mana costs of permanents you control counts toward your devotion to black.)

At the beginning of your upkeep, sacrifice a creature.

When Alchemist's Vial enters the battlefield, draw a card.

{1}, {T}, Sacrifice Alchemist's Vial: Target creature can't attack or block this turn.

When Alpine Guide enters the battlefield, you may search your library for a Mountain card, put that card onto the battlefield tapped, then shuffle.

Alpine Guide attacks each combat if able.

When Alpine Guide leaves the battlefield, sacrifice a Mountain.

Sacrifice a creature: Target player mills cards equal to the sacrificed creature's power.

As an additional cost to cast this spell, sacrifice a creature.

Draw two cards.

Flying

Apocalypse Demon's power and toughness are each equal to the number of cards in your graveyard.

At the beginning of your upkeep, tap Apocalypse Demon unless you sacrifice another creature.

Flying, haste

You may exert Glorybringer as it attacks. When you do, it deals 4 damage to target non-Dragon creature an opponent controls. (An exerted creature won't untap during your next untap step.)

Indestructible, haste

Hazoret the Fervent can't attack or block unless you have one or fewer cards in hand.

{2}{R}, Discard a card: Hazoret deals 2 damage to each opponent.

When Mogis's Marauder enters the battlefield, up to X target creatures each gain intimidate and haste until end of turn, where X is your devotion to black. (A creature with intimidate can't be blocked except by artifact creatures and/or creatures that share a color with it. Each {B} in the mana costs of permanents you control counts toward your devotion to black.)

Indestructible

As long as your devotion to black and red is less than seven, Mogis isn't a creature.

At the beginning of each opponent's upkeep, Mogis deals 2 damage to that player unless they sacrifice a creature.

Indestructible

As long as your devotion to red is less than five, Purphoros isn't a creature.

Other creatures you control have haste.

{2}{R}: You may put a red creature card or an artifact creature card from your hand onto the battlefield. Sacrifice it at the beginning of the next end step.

Indestructible

As long as your devotion to red is less than five, Purphoros isn't a creature.

Whenever another creature enters the battlefield under your control, Purphoros deals 2 damage to each opponent.

{2}{R}: Creatures you control get +1/+0 until end of turn.

Flying, double strike

When Terror of Mount Velus enters the battlefield, creatures you control gain double strike until end of turn.

Flying

Spells your opponents cast that target Terror of the Peaks cost an additional 3 life to cast.

Whenever another creature enters the battlefield under your control, Terror of the Peaks deals damage equal to that creature's power to any target.