Cards similar to Blasphemous Act:

Blood for the Blood God

Blood for the Blood God!

Instant

This spell costs less to cast for each creature that died this turn.
Discard your hand, then draw eight cards. Blood for the Blood God! deals 8 damage to each opponent. Exile Blood for the Blood God!

9.3 /10
$8.63
Cinderslash Ravager

Cinderslash Ravager

Creature — Phyrexian Warrior (5/5)

This spell costs less to cast for each permanent you control with oil counters on it.
Vigilance
When Cinderslash Ravager enters, it deals 1 damage to each creature your opponents control.

3.3 /10
$0.02
Explosive Singularity

Explosive Singularity

Sorcery

As an additional cost to cast this spell, you may tap any number of untapped creatures you control. This spell costs less to cast for each creature tapped this way.
Explosive Singularity deals 10 damage to any target.

6.9 /10
$0.21
Extus Oriq Overlord  Awaken the Blood Avatar

Extus, Oriq Overlord // Awaken the Blood Avatar

Legendary Creature — Human Warlock // Sorcery (2/4)

Double strike
Magecraft — Whenever you cast or copy an instant or sorcery spell, return target nonlegendary creature card from your graveyard to your hand.

Awaken the Blood Avatar

As an additional cost to cast this spell, you may sacrifice any number of creatures. This spell costs less to cast for each creature sacrificed this way.
Each opponent sacrifices a creature of their choice. Create a 3/6 black and red Avatar creature token with haste and "Whenever this creature attacks, it deals 3 damage to each opponent."

6.9 /10
$0.47
Lux Artillery

Lux Artillery

Artifact

Whenever you cast an artifact creature spell, it gains sunburst. (It enters with a +1/+1 counter on it for each color of mana spent to cast it.)
At the beginning of your end step, if there are thirty or more counters among artifacts and creatures you control, this artifact deals 10 damage to each opponent.

8 /10
$0.60
Omniclown Colossus  Pieroclasm

Omniclown Colossus // Pie-roclasm

Artifact Creature — Clown Robot // Sorcery — Adventure (7/7)

Affinity for Clowns (This spell costs less to cast for each Clown you control.)
Trample

Pie-roclasm

Pie-roclasm deals - damage to each non-Clown creature. (How to calculate - isn't important. It's a smidgen more than 3.)

1 /10
$0.06

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