Spined Sliver 
Creature — Sliver
$0.40 #18267 0.24 28.6 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?
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General Marhault Elsdragon88%
$0.31↓#8337↑0.11↓4.1 years↓
"Whenever a creature you control becomes blocked, it gets +3/+3 until end of turn for each creature blocking it."
Berserk Murlodont81%
$0.14↓#27836↓0.12↓23.7 years↓
"Whenever a Beast becomes blocked, it gets +1/+1 until end of turn for each creature blocking it."
Elvish Berserker78%
$0.09↓#23934↓0.00↓28.3 years
"Whenever this creature becomes blocked, it gets +1/+1 until end of turn for each creature blocking it."
Sparring Golem78%
$0.18↓#30895↓0.1926.0 years↓
"Whenever this creature becomes blocked, it gets +1/+1 until end of turn for each creature blocking it."
Rabid Elephant78%
$0.09↓#29310↓0.10↓25.1 years↓
"Whenever this creature becomes blocked, it gets +2/+2 until end of turn for each creature blocking it."
Gang of Elk78%
$0.28↓#28061↓0.00↓27.7 years
"Whenever this creature becomes blocked, it gets +2/+2 until end of turn for each creature blocking it."
Rabid Wolverines77%
$0.09↓#31459↓0.00↓28.3 years
"Whenever this creature becomes blocked by a creature, this creature gets +1/+1 until end of turn."
Cave Tiger77%
$0.18↓#29993↓0.00↓28.0 years
"Whenever this creature becomes blocked by a creature, this creature gets +1/+1 until end of turn."
She-Hulk, Wallbreaker76%
$0.35↓#11308↑0.36↑0.3 years↓
"Whenever a Hero you control becomes blocked, put a +1/+1 counter on that Hero for each creature blocking it."
Pygmy Troll74%
$0.14↓#29552↓0.05↓28.3 years
"Whenever this creature becomes blocked by a creature, this creature gets +1/+1 until end of turn."
Beastmaster's Magemark72%
$0.12↓#22361↓0.2720.7 years↓
"Whenever a creature you control that's enchanted becomes blocked, it gets +1/+1 until end of turn for each creature blocking it."
Watcher Sliver70%
$0.16↓#181620.2920.0 years↓
"All Sliver creatures get +0/+2."