U.A. Blockbacker

 This monster is based on the linebacker in North American football, who plays an important role in their team's defensive strategy.

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Blockbacker in this card's name is a portmanteau of the terms linebacker and blocking, the latter term referring to legal movements a player can make to block another player's path with their body.

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This monster's effect reflects the blitz tactic in football, in which linebackers can be called upon to tackle the quarterback (reflecting the change in battle position and effect negation).

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This monster appears in the artwork of Defense Zone and Loss Time.

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OCG Rulings

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The effect "You can Special Summon this card (from your hand) by returning 1 "U.A." monster you control to the hand, except "U.A. Blockbacker"." is not an Ignition, Trigger, Quick, or Continuous Effect. (Special Summoning this way does not make a Chain Link.): U.A. Blockbacker

When Special Summoning it using the effect "You can Special Summon this card (from your hand) by returning 1 "U.A." monster you control to the hand, except "U.A. Blockbacker".", you return one face-up "U.A." monster in your Monster Zone to your hand, then after that you Special Summon "U.A. Blockbacker". (Returning the monster to the hand is not treated as the last thing to happen.)

The effect "Once per turn, when your opponent Special Summons a monster(s): You can change their battle positions, and if you do, negate their effects." is a Trigger Effect. (It does not target. Also, it cannot be activated during the Damage Step.)

The effects "You can change their battle positions" and "negate their effects" are applied at the same time.