You requested my feedback on Ambush cards, so here it is.
Dimensional Striker: I like it because it's cheap, rushable, can provide a good strategy even as a single card and is good even on its own.
Flock of Birds, Decoy, Land Wyrm, Alligator seem like creatures with the sole purpose of being ambushers with a slight mechanical difference that keeps them from being copy/paste. Sorry if this sounds rough, it isn't a bad remark: that is why you created them after all, right? But, of these I like only the Wyrm. The mechanic is simple enough to be effective and can make for a great card. The rest try to expand different mechanics but seem to lack the simplicity Dimensional Striker and Land Wyrm warrant (or the originality, in the case of Flock of Birds).
Ghost Captain and Graviton Captain seem too complicated and lose most of their appeal to me. Plus, I don't like Graviton Captain to have another spawn ability for
.
Tactician seems ok, Tactics the same, Retreat is a great idea (but costs WAY too much IMO, maybe reduce its effect a bit but that's definitely too much quanta).
Yeah, I'm a fan of simpler cards.
anyway, that's just my 2cps. And it's mostly taste-based judgement, so you can just ignore it.