With serialized cards its an even more interesting question
Everything else in the pallet, from AU$45 Brilliant Stars 3-pack blisters to AU$282 Paldean Fates booster boxes to AU$282 Hidden Fates ETBs, is margin on top of that
Each series has a specific theme, so it might be hard to decide which one to start collecting
What about something like: Creatures (8) Planeswalkers (4) Lands (24) Spells (24) As much Niv-Mizzet action as this list packs, amusingly, Magic Online player TRUTHORDARE found a way to go even harder
This strategy is likely going to become a staple in the format, in some form or another: Creatures (32) 4 Sylvan Messenger 1 Fleshbag Marauder 4 Elvish Visionary 4 Elvish Mystic 1 Reclamation Sage 3 Nissa, Vastwood Seer 2 Gilt-Leaf Winnower 1 Dwynen, Gilt-Leaf Daen 4 Dwynen's Elite 4 Gnarlroot Trapper 4 Shaman of the Pack Lands (23) Spells (5) A fairly in-depth examination of most of the new Elves can be found here
Still, over $22 for a card printed in 1999 is fairly impressive, and the overall popularity of the Pikachu evolution line the face of the entire Pokemon franchise means that Raichu, and its Fossil printing, will always be a hot ticket on the secondary market