Lavaborn Muse 

Creature — Spirit
At the beginning of each opponent's upkeep, if that player has two or fewer cards in hand, this creature deals 3 damage to that player.
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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.
Hellfire Mongrel 98%
$0.32#22192
"At the beginning of each opponent's upkeep, if that player has two or fewer cards in hand, this creature deals 2 damage to that player."
Invasion of Eldraine // Prickle Faeries 95%
$0.18#15698
"At the beginning of each opponent's upkeep, if that player has two or fewer cards in hand, this creature deals 2 damage to them."