Etali's Favor 
Enchantment — Aura
$0.27 #7061 0.27 2.9 years
Enchant creature you control
When this Aura enters, discover 3. (Exile cards from the top of your library until you exile a nonland card with mana value 3 or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.)
Enchanted creature gets +1/+1 and has trample.
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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.
Geological Appraiser96%
$0.20↓#13526↓0.47↑2.9 years
"When this creature enters, if you cast it, discover 3."
Trumpeting Carnosaur94%
$1.88↑#1659↑0.282.9 years
"When this creature enters, discover 5."
Daring Discovery87%
$0.25↓#11754↓0.00↓2.9 years
"Discover 4."
Meteoric Mace86%
$0.17↓#9505↓0.245.9 years↑
"Equipped creature gets +4/+0 and has trample."
+1 more matching line
Chimil, the Inner Sun86%
$7.85↑#743↑0.73↑2.9 years
"At the beginning of your end step, discover 5."
Primordial Gnawer82%
$0.18↓#20518↓0.362.9 years
"When this creature dies, discover 3."
Franklin Richards, Ascendant80%
$0.24↓#14117↓0.330.3 years↓
"At the beginning of combat on your turn, if you've cast a noncreature spell this turn, discover 6."
Tilonalli's Crown79%
$0.17↓#18494↓0.00↓8.8 years↑
"Enchanted creature gets +3/+0 and has trample."
Setessan Training78%
$0.22↓#10858↓0.09↓6.7 years↑
"Enchanted creature gets +1/+0 and has trample."
+2 more matching lines
Audacity78%
$0.33↑#4860↑0.04↓3.9 years
"Enchanted creature gets +2/+0 and has trample."
+1 more matching line
Hit the Mother Lode78%
$0.34↑#1804↑0.17↓2.9 years
"Discover 10. If the discovered card's mana value is less than 10, create a number of tapped Treasure tokens equal to the difference."
Digsite Conservator78%
$0.16↓#19575↓0.242.9 years
"When this creature dies, you may pay 
. If you do, discover 4."
. If you do, discover 4."
Sweet-Gum Recluse76%
$0.44↑#5067↑0.06↓5.9 years↑
"Cascade"
Savage Hunger76%
$0.06↓#28393↓0.00↓18.0 years↑
"Enchanted creature gets +1/+0 and has trample."
Walk with the Ancestors76%
$0.10↓#12932↓0.06↓2.9 years
"Return up to one target permanent card from your graveyard to your hand. Discover 4."
Fists of Ironwood76%
$0.16↓#10785↓0.12↓21.0 years↑
"Enchanted creature has trample."
+2 more matching lines
Zoetic Glyph76%
$0.19↓#18356↓0.00↓2.9 years
"When this Aura is put into a graveyard from the battlefield, discover 3."
Cartouche of Strength74%
$0.17↓#10799↓0.00↓9.5 years↑
"Enchanted creature gets +1/+1 and has trample."
+1 more matching line
Captured Sunlight74%
$0.14↓#22133↓0.12↓17.5 years↑
"Cascade When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order."
Maelstrom Colossus74%
$0.41↑#4540↑0.03↓5.9 years↑
"Cascade When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order."