Well Rested 

Enchantment — Aura
$2.68 #4032 0.44 2.6 years
Enchant creature
Enchanted creature has "Whenever this creature becomes untapped, put two +1/+1 counters on it, then you gain 2 life and draw a card. This ability triggers only once each turn."
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Cards similar to Well Rested 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.
Sphinx's Disciple86%
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"Whenever this creature becomes untapped, draw a card."
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"Whenever this creature becomes untapped, put a +1/+1 counter on it."
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"Whenever this card become untapped, put a +1/+1 counter on them."
Oreskos Sun Guide80%
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"Whenever this creature becomes untapped, you gain 2 life."
Primal Empathy74%
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"At the beginning of your upkeep, draw a card if you control a creature with the greatest power among creatures on the battlefield. Otherwise, put a +1/+1 counter on a creature you control."
Staggering Insight72%
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"Enchanted creature gets +1/+1 and has lifelink and "Whenever this creature deals combat damage to a player, draw a card.""
Wylie Duke, Atiin Hero71%
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"Whenever this card becomes tapped, you gain 1 life and draw a card."
Danny Pink70%
$20.02↑#2712↑0.55↑3.0 years
"Creatures you control have "Whenever one or more counters are put on this creature for the first time each turn, draw a card.""