I think the issue with testing is I can't really think of a deck to put Lapras GX into easily slip into. You would have to build a deck around it's second attack, Blizzard Burn. Collect will always have the issue of N shuffling back those cards you drew making it's efforts naught, maybe turn one if needed. Ice Beam GX is pretty much the same cost as Blizzard Burn anyways so you might as well treat paying for it as the same.
Easily if Nessy here is our primary attacker you need a playset of Max Elixirs to get to Blizzard Burning faster at least by your second turn. Main Tool would be Fighting Fury Belt because we're a basic Pokemon only maybe some Float Stones for our bench sitters but I think Switch/Escape Rope/Olympia should be our main option to retreat to reset our attack status alongside Pokemon Rangers because they're the morphinominal Poke Rangers that fix our bad Blizzard Burn Juju.
Since we are going with only Basic Water I would try out Octillery for draw then MAYBE Regice as a second attacker but the issue for playtesting Regice is that the upcoming GXes don't care so I'm unsure of what would be good second fiddles. Blizzard Burn does a very respectable chunk of damage on a Basic for it's cost and negative effect so perhaps just more support Pokemon will do. One Tech Manaphy would have use but I still would want a few retreat Trainers for ability lock for Garbo and Hex.
Certainly not going to overtake the format or anything. GX attack is underwhelming but I think Blizzard Burn hits hard enough to be playable. Maybe not hardcore competitive but functional.
I'm digging these GX cards so far.
