Well Rested 

Enchantment — Aura
$3.53 #3966 0.25 2.5 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."
Pheres-Band Tromper82%
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"Whenever this creature becomes untapped, put a +1/+1 counter on it."
Oreskos Sun Guide80%
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"Whenever this creature becomes untapped, you gain 2 life."
Tui and La, Moon and Ocean80%
$0.50↓#12646↓0.00↓0.8 years↓
"Whenever this card become untapped, put a +1/+1 counter on them."
Primal Empathy74%
$0.24↓#7769↓0.11↓6.4 years↑
"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%
$0.19↓#5492↓0.266.6 years↑
"Enchanted creature gets +1/+1 and has lifelink and "Whenever this creature deals combat damage to a player, draw a card.""
+1 more matching line
Wylie Duke, Atiin Hero72%
$0.32↓#7944↓0.15↓2.4 years
"Whenever this card becomes tapped, you gain 1 life and draw a card."
Danny Pink70%
$18.66↑#2769↑0.262.9 years
"Creatures you control have "Whenever one or more counters are put on this creature for the first time each turn, draw a card.""
Level Up70%
$2.34↓#43910.00↓0.5 years↓
"Enchanted creature has "Whenever this creature attacks, double the number of +1/+1 counters on it. Then if it has power 10 or greater, draw a card.""