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
For example, let's compare Mourning Thrull with a Spirit Linked Suntail Hawk
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Personal Tutor is sorcery speed and can only find sorceries but adds consistency to your deck that you cant pass up
The key tweak is the shift in how energy works: rather than filling your deck with specific energy cards, you simply select the type (or types) of a deck when building it, and energy is automatically generated once per turn for you to attach how you wish (for two-type decks, which are required for the Dragon Pokmon lines such as Dragonites, which type comes up next is randomised, which effectively replicates a multi-type deck equivalent in real life)
Lurrus is one of the few cards to be banned in Vintage, the most high-powered MTG format (there was no point Restricting it, since you only need one copy of the card in your deck)