This card's amount of heads is equal to its Level.
In Greek mythology, the "Lernean Hydra" is an ancient serpent-like beast that possessed many heads. It was killed by Heracles as the second of his Twelve Labours.
According to the legends and myths of the Nyanga (people who live in the Congo River region), "Kirimu" is a dragon described as "a huge animal with a black hide, seven heads, seven horns, seven eyes, teeth like a dog, a huge belly, and the tail of an eagle".
It was said to have gone from the mountains into a village and ate a tribe of people. Later, when it was slain, the people were rescued from its stomach. This may be a reference to its effect; It goes to the deck to "eat" a card (remove it from play) and getting it back later on.