I boosted speed (135, early Library–Always faster than Indoraptor, always slower than Erlidominus) and damage on Erlikospyx, but not so much as I have Erlidom. If the opponent starts with Erlidom vs. my Erlikospyx, the opposing Erlidom will go first and one-shot my Spyx every time (unless I decide to swap something else in its place, which is rare). I just consider that the price of losing the rock-paper-scizzors intro. Then I know what I’m countering, and the enemy Erlidom’s got its rampage on cooldown. Usually I can work with that. It also happens rarely enough (which I find slightly surprising), so I really don’t mind those occasional opening tragedies.
Against Indo G2, I think Erlikospyx is actually a great opener. Yes, it’ll lose. ANYTHING will lose. I now use G2 Indo in my lineup with boosts and great magnificence, and I still look forward to her downfall. Spyx has outpaced any G2 Indo I’ve ever met on round one, and popping off a non-distracted precise rampage quickly takes a sizeable chunk out of it that I’m pretty pleased with.
I actually don’t have Magna or Quetzorion yet. I think Magna is one of those that needs extra boost attention to work (especially in speed), but when it does, it works dang well. Speaking from lack of experience, I’d recommend that over Spyx if you can keep it at a good level.
I love Quetzorion. I get excited when my opponents use it. I see it so rarely, but I really like what it’s capable of and that it’s within reason (unlike G2 Indo). I’ve seen so little of it that I can’t make any confident comment, but I know I like to have at least 2 swap-in dinos to make sure I can use my full squad of 4 in most battles. I expect Quetzorion will be up to the task and beautifully fun to use.
Edit: I didn’t say anything about prioritizing Erlikospyx for boosts. I haven’t thought about this too hard, but I think one of the wonderful things about bleeders is they don’t need many boosts to do their job. Debilitating Distraction & Lethal Wound get the job done. I only boosted damage because I noticed mine was painfully close to finishing targets so many times. I no longer have that issue. I don’t try to make Spyx into an Erlidom. It’s more like a stealth assassin; it does the job, and if it gets caught, it dies. You shouldn’t need a ton of boosts to get the job done. It’s a good member of your team for making sure the other flowers in your garden get some water. That’s one reason I liked Suchotator. It don’t need no boosts