Pilgrim Reaper

 This card's name is a portmanteau of pilgrim and grim reaper.

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OCG Rulings

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The "This card gains 200 ATK and DEF for every DARK monster in either player's Graveyard." effect is a Continuous Effect.: Pilgrim Reaper

The "You can detach 1 Xyz Material from this card; each player sends the top 5 cards from their Deck to the Graveyard (or their entire Deck, if less than 5)." effect is an Ignition Effect. (Detaching 1 Xyz Material from this card is a cost to activate this effect.)

The "You can detach 1 Xyz Material from this card; each player sends the top 5 cards from their Deck to the Graveyard (or their entire Deck, if less than 5)." effect cannot be activated if either player has 4 or less cards in their Deck.

This effect cannot be activated if both players don't have 5 or more cards in their Deck. Furthermore, when the effect resolves, if either player has 4 or less cards in their Deck, the effect is applied normally. (When the effect resolves, the players who have 4 or less cards in their Deck send all the cards from their Deck to the Graveyard.): Can the effect of "Pilgrim Reaper" be activated if either player has 4 or less cards in their Deck?