Let's break down how your first game will actually look
Slayers Stronghold ($2) This is in a lot more decks that you think, and aside from the SL version thats all in black, one of the only special versions out there
Prices vary by set and rarity, but most Japanese Pokmon booster boxes range from 4,500 to 6,000 (about $30$45 USD)
-----Transform----- Princess Luna Legendary Creature - Alicorn Flying When this creature transforms into Princess Luna, choose up to six cards you own from outside the game with a moon in their art, then exile those cards
Reverse holos are more common in modern packs but can be harder to find in mint condition, especially older ones
Opening Leyline certainly trumps opening Rest in Peace, but drawing it later reveals its shortcomings