Iron Chain Coil

 This monster appears in the artworks of Poison Chain and Tuner Capture.

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In Yu-Gi-Oh! 5D's, this card is Level 4 instead.

In the "TCG", the text specifies that the ATK and DEF gain is applied as long as this card is face-up on the field.
In the "OCG", rulings state that it applies as long as the affected monster is face-up on the field.

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OCG Rulings

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The monster effect of "Iron Chain Coil" is an Ignition Effect.: Iron Chain Coil

The effect targets 1 face-up "Iron Chain" in the player's Monster Zone. ("Iron Chain Coil" can also target itself.)

The ATK and DEF increase as a result of the monster effect of "Iron Chain Coil" applies as long as the targeted monster is face-up in the Monster Zone.

If "Skill Drain" was activated after ATK is increased by the effect of "Iron Chain Coil: If "Skill Drain" was activated after ATK is increased by the effect of "Iron Chain Coil", does the increased value return to its original value?

Previously Official Rulings

"Iron Chain Coil's" effect targets 1 face-up "Iron Chain" monster you control.