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That opponent is chosen as part of that additional cost

Drawing an extra card each turn is a great effect, but dont forget about all the other effects either

Three mana for two reanimations is a rate nothing else in Magic can match

If you include this in a deck that is using virtually only Historic permanents, you can essentially turn it into a less effective version of an Overloaded Cyclonic Rift

Maybe the defensive potential of steel

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