In Limited Cavern Harpy was a deadly card for the right decks, impossible to kill and giving you a lot of tricks to pull off
Due to the bespoke nature of the product, no exchanges, changes of mind, or returns will be accepted
Anyway, back on topic, all Ramp decks since the beginning have looked to build their mana to ridiculous levels as quickly as possible and then use that advantage to drop more powerful win conditions earlier than their opponent and ride that to victory
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 Cloud's last ability
In addition , its a perfect centerpiece for display or themed decks