Helitrooper
Flying Whenever this creature attacks, another target attacking creature gains flying until end of turn. Equip abilities you activate that target this creature cost {2} less to activate.
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Official rulings (2) · Scryfall
Some Equipment creature cards in other sets have reconfigure, a different ability that attaches them to a creature. Reconfigure is not an equip ability, and reconfigure costs are not reduced by Helitrooper's last ability. Equip variants or equip abilities with restrictions, like the "equip legendary creature" ability of Wrecking Ball Arm, are still equip abilities, and their costs will be reduced by Helitrooper's last ability. (Sure, Helitrooper isn't normally legendary, but there are ways to fix that.)
Helitrooper's last ability reduces only the amount of generic mana you pay for equip abilities that target Helitrooper. For example, it will reduce {2} to {0}, but it will have no effect on an equip cost of {G}.