Spined Sliver 
Creature — Sliver
$0.41 #17887 0.06 28.5 years
Whenever a Sliver becomes blocked, that Sliver gets +1/+1 until end of turn for each creature blocking it.
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Cards similar to Spined Sliver 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.
Berserk Murlodont84%
$0.19↓#27566↓0.53↑23.6 years↓
"Whenever a Beast becomes blocked, it gets +1/+1 until end of turn for each creature blocking it."
General Marhault Elsdragon84%
$0.34↓#8159↑0.104.0 years↓
"Whenever a creature you control becomes blocked, it gets +3/+3 until end of turn for each creature blocking it."
Elvish Berserker82%
$0.10↓#23585↓0.17↑28.2 years
"Whenever this creature becomes blocked, it gets +1/+1 until end of turn for each creature blocking it."
Sparring Golem82%
$0.18↓#30669↓0.47↑25.9 years↓
"Whenever this creature becomes blocked, it gets +1/+1 until end of turn for each creature blocking it."
Rabid Elephant82%
$0.15↓#28928↓0.0024.9 years↓
"Whenever this creature becomes blocked, it gets +2/+2 until end of turn for each creature blocking it."
Gang of Elk82%
$0.28↓#27813↓0.0027.6 years
"Whenever this creature becomes blocked, it gets +2/+2 until end of turn for each creature blocking it."
Cave Tiger80%
$0.16↓#29698↓0.0027.9 years
"Whenever this creature becomes blocked by a creature, this creature gets +1/+1 until end of turn."
Rabid Wolverines80%
$0.09↓#31165↓0.1528.2 years
"Whenever this creature becomes blocked by a creature, this creature gets +1/+1 until end of turn."
Pygmy Troll77%
$0.10↓#29182↓0.43↑28.2 years
"Whenever this creature becomes blocked by a creature, this creature gets +1/+1 until end of turn."
Beastmaster's Magemark74%
$0.12↓#22064↓0.0720.6 years↓
"Whenever a creature you control that's enchanted becomes blocked, it gets +1/+1 until end of turn for each creature blocking it."
She-Hulk, Wallbreaker74%
$0.30↓#12248↑0.000.2 years↓
"Whenever a Hero you control becomes blocked, put a +1/+1 counter on that Hero for each creature blocking it."
Watcher Sliver73%
$0.13↓#180130.27↑19.9 years↓
"All Sliver creatures get +0/+2."
Sidewinder Sliver72%
$0.27↓#12121↑0.44↑19.9 years↓
"All Sliver creatures have flanking."
Viashino Weaponsmith70%
$0.15↓#31314↓0.0027.9 years
"Whenever this creature becomes blocked by a creature, this creature gets +2/+2 until end of turn."
Bonesplitter Sliver70%
$0.20↓#10506↑0.1219.9 years↓
"All Sliver creatures get +2/+0."
Blade Sliver70%
$0.27↓#14273↑0.44↑23.6 years↓
"All Sliver creatures get +1/+0."
Plated Sliver70%
$0.55↑#160130.27↑23.6 years↓
"All Sliver creatures get +0/+1."