Spiked Ripsaw 

Artifact — Equipment
$0.08 #25690 0.11 4.9 years
Equipped creature gets +3/+3.
Whenever equipped creature attacks, you may sacrifice a Forest. If you do, that creature gains trample until end of turn.
Equip
(
: Attach to target creature you control. Equip only as a sorcery.)
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Cards similar to Spiked Ripsaw 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.
Stitcher's Graft84%
$0.14↑#220600.25↑10.2 years↑
"Equipped creature gets +3/+3."
+1 more matching line
Argentum Armor80%
$2.73↑#2225↑0.40↑16.1 years↑
"Equipped creature gets +6/+6."
+2 more matching lines
Shard of Broken Glass79%
$0.11↑#215060.00↓10.5 years↑
"Equipped creature gets +1/+0."
+1 more matching line
Stormbeacon Blade78%
$0.23↑#12316↑0.051.5 years↓
"Equipped creature gets +3/+0."
+2 more matching lines
HYDRA Disintegrator76%
$0.21↑#275460.200.3 years↓
"Equipped creature gets +3/+3."
+1 more matching line
Vulshok Battlegear76%
$0.18↑#215300.00↓23.0 years↑
"Equipped creature gets +3/+3."
+1 more matching line
Doc Ock's Tentacles72%
$0.41↑#8119↑0.73↑1.1 years↓
"Equipped creature gets +4/+4."
+1 more matching line
Throwing Knife72%
$0.12↑#273800.0511.3 years↑
"Equipped creature gets +2/+0."
+2 more matching lines
Haunted Plate Mail72%
$0.14↑#218630.1113.3 years↑
"Equipped creature gets +4/+4."
+1 more matching line