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
Whenever Maui is used to challenge another character, the player can add an action card from their discard pile to their hand, which offsets the continuous problem of running out of cards
These topics are more generic, such as manabase, ramp, card draw, etc
Once the Beast token has attacked or blocked, removing all of your other attacking or blocking creatures won't cause it to stop attacking or blocking
But the Through the Ages cards complicate that process