(Subtypes include but are absolutely not limited to: Plains, Equipment, Aura, Arcane, Jace, Curse, Urza's, Ulamog's, etc.) The ability that defines Subgoyf's power and toughness applies in all zones, not just the battlefield
Im a big ex Holo collector myself so I am very much interested in what people think is the best Holo
I'd even argue that it's a good thing that you have to think about which catch-up cards you want to include in a deck instead of just mindlessly a bunch of staples together
For current decks, the only one that will add this card immediately is Gholdengo ex, which can use it to supplement its existing Technical Machine: Evolution package
The earliest MTG Final Fantasy card spoilers gave us a sneak peek at some of the mechanics and themes for the set
Squall, SeeD Mercenary Squall, SeeD Mercenary is in excellent knight colors and has a powerful mini-Sun Titan effect that works perfectly with Orzhov cards