Snag 
Instant
$0.27 #18103 0.26 26.3 years
You may discard a Forest card rather than pay this spell's mana cost.
Prevent all combat damage that would be dealt by unblocked creatures this turn.
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Cards similar to Snag 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.
Harmless Assault93%
$0.12↓#25098↓0.37↑16.4 years↓
"Prevent all combat damage that would be dealt this turn by attacking creatures."
Obscuring Haze86%
$4.85↑#1503↑0.84↑6.4 years↓
"Prevent all damage that would be dealt this turn by creatures your opponents control."
Thwart the Enemy86%
$0.15↓#14375↑0.10↓6.4 years↓
"Prevent all damage that would be dealt this turn by creatures your opponents control."
Terrifying Presence85%
$0.24↓#11824↑0.2614.3 years↓
"Prevent all combat damage that would be dealt by creatures other than target creature this turn."
Heavy Fog80%
$27.75↑#24500↓0.00↓27.3 years↑
"Prevent all damage that would be dealt to you this turn by attacking creatures."
Deep Wood80%
$0.23↓#24658↓0.2229.3 years↑
"Prevent all damage that would be dealt to you this turn by attacking creatures."
Respite80%
$0.37↑#8718↑0.2428.9 years↑
"Prevent all combat damage that would be dealt this turn. You gain 1 life for each attacking creature."
Vine Snare80%
$0.16↓#27824↓0.00↓11.1 years↓
"Prevent all combat damage that would be dealt this turn by creatures with power 4 or less."
Tangle79%
$4.19↑#6252↑0.42↑25.9 years
"Prevent all combat damage that would be dealt this turn."
Hindervines78%
$0.15↓#156660.2213.6 years↓
"Prevent all combat damage that would be dealt this turn by creatures with no +1/+1 counters on them."
Haze Frog78%
$0.37↑#9855↑0.43↑16.4 years↓
"When this creature enters, prevent all combat damage that other creatures would deal this turn."
Outbreak77%
$0.18↓#29611↓0.3026.3 years
"You may discard a Swamp card rather than pay this spell's mana cost."
Fog76%
$0.21↓#669↑0.47↑33.1 years↑
"Prevent all combat damage that would be dealt this turn."
Holy Day76%
$0.27#5933↑0.06↓32.3 years↑
"Prevent all combat damage that would be dealt this turn."
Darkness76%
$11.97↑#1876↑0.42↑32.3 years↑
"Prevent all combat damage that would be dealt this turn."
Winds of Qal Sisma76%
$0.33↑#9810↑0.2611.6 years↓
"Prevent all combat damage that would be dealt this turn."
Root Snare76%
$0.17↓#11683↑0.14↓8.1 years↓
"Prevent all combat damage that would be dealt this turn."
Encircling Fissure76%
$0.17↓#207580.3510.9 years↓
"Prevent all combat damage that would be dealt this turn by creatures target opponent controls."
Serene Sunset76%
$0.22↓#213040.3124.3 years↓
"Prevent all combat damage X target creatures would deal this turn."
Hunter's Ambush76%
$0.13↓#201590.40↑12.1 years↓
"Prevent all combat damage that would be dealt by nongreen creatures this turn."