you're kind of in the "don't give a fuck zone" but when you get deeper into the ladder, people are pretty strict about what they play. It can be really lame, as you're going against try hards, which is a euphemism for "guy who is playing more seriously than you, who your shit deck won't beat."
Really though, get the fun matches in now because in about 4 days, everyone will be running around with juicy melons and fucking unused (and likely dusted) before Thursday Dollmaster Dorians, after their turn 1 biology project.