Amalgam Intruder

Whenever Amalgam Intruder becomes
blocked, each player loses 1 life and discards
a card.
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"It runs everything amuck!" Barked Vlatier.
"Don't you think we ought to contain it better?"
"I'm sorry, sir," Replied a stoutly knight. "But
we can't kill it, and every time we try to trap it,
it's cage is in shreds by morning."