Reaver Drone {B}
Creature — Eldrazi Drone
Devoid (This card has no color.)
At the beginning of your upkeep, you lose 1 life unless you control another colorless creature.
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Cards that do something similar expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Scourge of Numai 93%
$0.27#28809
"At the beginning of your upkeep, you lose 2 life if you don't control an Ogre."
Mindwrack Demon 91%
$0.38#19202
"At the beginning of your upkeep, you lose 4 life unless there are four or more card types among cards in your graveyard."
Vampire Lacerator 90%
$0.10#21780
"At the beginning of your upkeep, you lose 1 life unless an opponent has 10 or less life."
The One Ring 90%
$101.85#90
"At the beginning of your upkeep, you lose 1 life for each burden counter on this card."
Forsaken Wastes 85%
$14.85#14214
"At the beginning of each player's upkeep, that player loses 1 life."
Rassilon, the War President 85%
$0.28#17519
"At the beginning of your upkeep, you lose 2 life and exile the top card of your library. You may play that card for as long as it remains exiled."
Nightshade Schemers 84%
$0.33#22824
"At the beginning of your upkeep, you may look at the top card of your library. If it shares a creature type with this creature, you may reveal it. If you do, each opponent loses 2 life."
Quest for the Nihil Stone 84%
$1.52#10315
"At the beginning of each opponent's upkeep, if that player has no cards in hand and this enchantment has two or more quest counters on it, you may have that player lose 5 life."