Admittedly, now is a tough time to start collecting the Pokmon TCG, but if you're keen to get some retail-priced booster packs and other products, there are a few tricks that may make your life a little easier
Being able to deal with both creatures and Planeswalkers is kinda relevant, because it was for a long time nearly impossible to deal with Teferi, Hero of Dominaria or even a 5+ loyalty Teferi, Time Raveler
The creature gets +X/+X until end of turn and you lose X life, where X is that cards mana value
She did not approve of Liesa's methods, and when Liesa made a pact with a demon lord, Avacyn declared her a heretic and destroyed her, along with her entire flight of angels
Both are the same thickness