Earth Vessel and Turo are clearly the best cards.
Sada is a really good supporter that just... doesn't have many good options to attach to. Scream Tail is way better off in a deck that does not need Sada (Gardevoir). Slither Wing, Brute Bonnet, and Sandy Shocks all have very awkward damage that don't work well to hit things efficiently. As of now Sada's kinda just left with this turbo-dark deck for Roaring Moon, which is very feasible to do between all the searching, discarding, and 2 different cards for energy accel (Dark Patch and Sada). Roaring Moon hitting 290 HP with Ancient Booster Capsule is also a great niche for the tool.
We need to find out if Future pokemon have any decent method of energy acceleration. Otherwise, they just end up in different decks and Future Radar kinda loses value. Iron Valiant is so far the only attacker in there that really stands out. Future Energy Capsule letting Iron Valiant hit 230 without needing to put its damage counters on the active is a great niche too.
I don't really know what to think of Mela because it doesn't help your early game at all, and the only pokemon that really get benefit out of it are pokemon that need 3 attachments and at least 1 fire. Pretty much all this does is fix up some clunk in Arcanine ex or some dedicated fire box deck running Delphox V, but those ideas are still really clunky even with Mela.
Tulip will not be tried in Gardy considering we haven't already seen Klara be tried. I don't think you're bothering to play this as an engine in Gholdengo either, and instead are focusing on consistency through metal energy, high drawpower, and energy retrieval items.
Guzzlord didn't have the ability to boost its attack enough to KO basic multi-prize Pokemon, I can definitely see turbo Iron Hands, running enough energy with Electric Generator can get 4 on there along with a manual attach, then with Future Boost Energy Capsule and 3 Regieleki VMax you're hitting 230 and also in general in this format being able to take extra prizes against Lost Box many single prizers makes the matchup better.
While that is correct about Guzzlord, Iron Hands / Eleki will not work well for the same reason Miraidon / Eleki does not work well.