As an additional cost to cast this spell, sacrifice a creature.
Fall Upon Your Blade deals damage equal to the sacrificed creature's power to any target.
Cycling {2}

Put a +1/+1 counter on target creature. It gets +2/+0 and gains trample until end of turn.

Whenever you sacrifice a permanent, double this creature's power until end of turn.
When this creature dies, create an X/X black Demon creature token, where X is this creature's power.

If you would create one or more artifact tokens, instead create those tokens plus an additional Treasure token.
{2}{R}, Sacrifice X artifacts: This creature gets +X/+0 until end of turn.

This spell costs {X} less to cast, where X is the number of Mountains you control plus the number of cards with a cycling ability in your graveyard.
Search your library for a Dragon or Phoenix card, put it onto the battlefield, then shuffle.
Mountaincycling {2}

Revered
Whenever this creature attacks, you may pay {2} and discard a card. If you do, draw a card.

Damned — When this creature enters, if you've sacrificed a permanent this turn, this creature deals 2 damage to each opponent.

Bleeding Out deals 3 damage to any target. Excess damage dealt to a creature or planeswalker this way is dealt to its controller instead.

Haste
When this creature enters, put a +1/+1 counter on target creature you control.

Exalted
Whenever a creature you control attacks alone, this creature deals 1 damage to each opponent and you gain 1 life.

You draw two cards and you lose 2 life.
Damned — If you've sacrificed a permanent this turn, add {B}{B}.

When this creature dies, it deals 2 damage to each opponent and you gain 2 life.
{6}{B}, Exile this card from your graveyard: It deals 3 damage to each opponent and you gain 3 life.

This creature gets +1/+1 for each card with a cycling ability in your graveyard.
Cycling {2}

Create a token that's a copy of target creature. It gains haste until end of turn. Sacrifice it at the beginning of the next end step.

When this creature enters, you may sacrifice another creature. If you do, create a number of Treasure tokens equal to that creature's power.

{1}, Sacrifice another creature: Put a +1/+1 counter on this creature.

Each creature your opponents control gets -1/-1 until end of turn.

Menace

As an additional cost to cast this spell, sacrifice an artifact or creature.
Draw two cards.

Return target creature card with mana value 3 or less from your graveyard to the battlefield with an exalted counter on it.

Lifelink
Whenever this creature or another creature you control enters, if it entered from a graveyard or was cast from a graveyard, put two exalted counters on it.

Put target creature card from a graveyard onto the battlefield under your control.
Cycling {1}{B}
When you cycle this card, target player mills three cards.

Choose one —
• Each opponent sacrifices a creature that's one or fewer colors.
• Each opponent sacrifices a creature that's two or more colors.

Flying
Exalted

When this creature enters, create a Treasure token.
Damned — At the beginning of your end step, this creature deals 1 damage to each opponent and you gain 1 life if you've sacrificed a permanent this turn.