If you have the kind of deck that can make a massive thing with haste and they suspect you are playing this they will always have to keep at least 2 toughness of blockers back or risk instant death to it
some of the other new cards are also slam-dunks for an Equipment style deck like this, such as Professor Hojo, Cid, Freeflier Pilot, Barret, Avalanche Leader, basically anything that works with equipment is great
If you insist on playing a Manalith variant, I highly suggest finding ones that give you additional advantages while theyre in play , like Bender's Waterskin or Coalition Relic
They're wildly expensive at the moment too, of course - but if you want at least a small discount on some Prismatic Evolutions packs, meaning more chances at that Umbreon, well, this could be it