Squirming Mass
Elite Beasts wriggle and writhe
Whenever a nearby minion dies, Squirming Mass permanently gains its power.
Brian Smith

FAQs
Q: Let's say the Mass is 1 power, and it fights another 1 power minion. What happens?
Both take 1 damage each, which results in their simultaneous death. That triggers Squirming Mass's ability, which means its gains +1 power, but it's already dying, and merely gaining power isn't enough to save it. (Something specifically that saves a unit from death would be necessary, like Gilded Aegis.) In this example, both minions are placed in the cemetery.
Q: Does this gain its own power when it dies?
Treat it as: Whenever another nearby minion dies, Squirming Mass permanently gains its power.
Q: If a minion's current power is different from its printed power when it dies, which value does Squirming Mass gain?
The current power of the minion that dies.
FAQs
Q: Let's say the Mass is 1 power, and it fights another 1 power minion. What happens?
Both take 1 damage each, which results in their simultaneous death. That triggers Squirming Mass's ability, which means its gains +1 power, but it's already dying, and merely gaining power isn't enough to save it. (Something specifically that saves a unit from death would be necessary, like Gilded Aegis.) In this example, both minions are placed in the cemetery.
Q: Does this gain its own power when it dies?
Treat it as: Whenever another nearby minion dies, Squirming Mass permanently gains its power.
Q: If a minion's current power is different from its printed power when it dies, which value does Squirming Mass gain?
The current power of the minion that dies.