In Hindu mythology, Ananta Shesha (which means Endless Shesha) is the king of the Nagas, the divine serpents. He is described as a seven (sometimes five) headed snake. He is believed to hold every planet on his hoods and is linked to the god Vishnu. This monster's effect is a reference to the belief that Ananta Sesha is responsible for the end of each Kalpa (time period allotted to the earth), reflecting this monster's mandatory effect of destroying 1 card on the field at the end of each turn.
This card is a BAM legend in the Yu-Gi-Oh! video game Yu-Gi-Oh! BAM, but it is Level 10 and has 1700 attack points, probably because its body is somehow equivalent to a thousand attack points, and its 7 heads could have a total of 700 attack points.