Death-Rattle Oni

six generic mana one black mana Creature — Demon SpiritPower and toughness5/4

Flash

This spell costs two generic mana less to cast for each creature that died this turn.

When this creature enters, destroy all other creatures that were dealt damage this turn.

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Showing March of the Machine: The Aftermath#13

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0.18 $

Foil 0.21 $

27 printings · up to 0.19 $

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Death-Rattle Oni rulings

2023-05-12
The cost-reduction ability of Death-Rattle Oni doesn't change its mana cost or mana value, only the total cost you pay. Specifically, Death-Rattle Oni's mana value is always 7.
2023-05-12
Count any creature that died during the turn, including token creatures, when calculating the cost reduction. For nontoken creatures that died, it doesn't matter what happened to the creature cards after they died.

Death-Rattle Oni keyword rules

Flash Rule 702.8

Flash is a static ability that functions in any zone from which you could play the card it’s on. “Flash” means “You may play this card any time you could cast an instant.”

Multiple instances of flash on the same object are redundant.