For a detailed breakdown on the reasons behind this, you can check out YouTuber Spice8Racks explanation of the origin of Rakshasas and how they were changed for Dungeons & Dragons and then Magic
The math becomes: Mega Charizard X Cost = $4.50 per pack 80 packs per SIR 5 SIRs = $1,800 So the pack-implied replacement cost of one raw Mega Charizard X ex is about $1,800
You'll take a hit on power and consistency by playing the alternatives, but you'll have more money in your pocket to allocate elsewhere
For example, to cast a sorcery spell from a graveyard, you can do so by paying its mana cost only during your main phase while the stack is empty
It's always a hit, whether the people getting the card are Pokmon fans or not
Requiring 3x Colorless Energy, this 80 DMG move also gives you one each of a Fire, Water, and Lightning Energy, and lets you attach them to your Benched cards in any way you like