I personally think that booster packs are a great way to find the cards you want, though it usually takes a significant amount of money and an extraordinary amount of luck to get very rare cards like Luxray GL LV
Keep in mind that it does compress a fair amount from what it looks like before its openedtheres a cardboard insert that increases its height, which can be discarded/recycled after opening the Elite Trainer Box
You need to sink 3 mana to get two lands, 7 to get three thats just inefficient
Big answers like Rune-Scarred Demon and Woodfall Primus
Now, finally, we've seen the lot, with Jace, The Perfected Mind
Keep your cards safe and protect them with Cosmic Encounter card sleeves to continue playing this intergalactic game for eons