The tier names are gemstones. The real order is how often a card shows up. Those two don't match — so this chart shows both. Top = hardest to pull.
Gemstones rank by how pretty they sound, not by scarcity. Proof from the ladder: Silver Rare appears ~1 in 3 packs, but Emerald Rare shows up every pack — so the "lesser" silver is actually the rarer card. Trust the pull rate and the ✦ star, never the gem name.
Every pack hands you one ER scene card, so it feels like a rare — it isn't. The real scene chase is the Day / Night ※ER pairs up in the Shining layer.
That's a different Kayou product — the collectible "Friendship Eternal" line (Moon / Rainbow Edition), not your TCG booster boxes. Its ladder, low → high: