Johtull Wurm 

Creature — Wurm
Whenever this creature becomes blocked, it gets -2/-1 until end of turn for each creature blocking it beyond the first.
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Cards that do something similar expected a card that isn't here?
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Jungle Wurm 94%
#30910
"Whenever this creature becomes blocked, it gets -1/-1 until end of turn for each creature blocking it beyond the first."
Plague Wight 93%
$0.06#27716
"Whenever this creature becomes blocked, each creature blocking it gets -1/-1 until end of turn."
Baneblade Scoundrel // Baneclaw Marauder 93%
$0.14#26154
"Whenever this creature becomes blocked, each creature blocking it gets -1/-1 until end of turn."
Order of the Mirror // Order of the Alabaster Host 89%
$0.09#27601
"Whenever this creature becomes blocked by a creature, the blocking creature gets -1/-1 until end of turn."
Rampaging Cyclops 86%
$0.03#31284
"This creature gets -2/-0 as long as two or more creatures are blocking it."