Coffin Seller

 The man in this card's artwork also appears in the artwork of Dark Deal.

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This card appears in the TCG/OCG artwork of Card of Last Will.

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Fatal Abacus has an effect similar to this card's, but affects both players.

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Both card's names and artworks are also macabre-themed.

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“Skull Invitation” is an arguably better card, as it cumulates the damage for all cards in general but punishes both players.

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OCG Rulings

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The activation of the card "Coffin Seller" can be performed at any time, except during the Damage Step.: Coffin Seller

The effect "Each time a monster(s) is sent to your opponent's Graveyard: Inflict 300 damage to your opponent" makes a Chain Link. (It does not target.)

The effect of "Coffin Seller" cannot be activated in the same Chain Link as the activation of the card.

While "Coffin Seller" is face-up in the Spell & Trap Zone, each time a monster is sent to the opponent's Graveyard, the effect activates and makes a Chain Link. (It activates even during the Damage Step.)

If an Xyz Material of an Xyz Monster is detached and sent to the Graveyard as a cost, the effects of "Skull Invitation" and "Coffin Seller

Previously Official Rulings

"Coffin Seller" applies its effect when monster(s) are sent from the hand, Deck, or the field to the Graveyard.

If multiple monsters are sent to the Graveyard at the same time (due to "Dark Hole", etc.) then inflict 300 damage only because it is considered as 1 time.

Multiple copies of "Coffin Seller" are cumulative.

Mentions in Other Rulings

Amplifier"Jinzo with Amplifier", your Trap Cards are not negated and their effects are applied, including "Coffin Seller"

Necrovalley: "Necrovalley" will NOT negate effects that are activated when a card is sent TO the Graveyard or that activate IN the Graveyard or that count cards in the Graveyard. So it will NOT negate the effects of "Coffin Seller"