These are one-time effects that WotC opts for when they want permanent cards that have more than one option

Release date: 2022-10-18 Prowl, Pursuit Vehicle Prowl, Stoic Strategist Ratchet, Field Medic Ratchet, Rescue Racer Jetfire, Air Guardian Jetfire, Ingenious Scientist Blitzwing, Adaptive Assailant Blitzwing, Cruel Tormentor Starscream, Power Hungry Starscream, Seeker Leader Slicer, High-Speed Antagonist Slicer, Hired Muscle Arcee, Acrobatic Coupe Arcee, Sharpshooter Blaster, Combat DJ Blaster, Morale Booster Cyclonus, Cybertronian Fighter Cyclonus, the Saboteur Flamewar, Brash Veteran Flamewar, Streetwise Operative Goldbug, Humanity's Ally Goldbug, Scrappy Scout Megatron, Destructive Force Megatron, Tyrant Optimus Prime, Autobot Leader Optimus Prime, Hero Soundwave, Sonic Spy Soundwave, Superior Captain Ultra Magnus, Armored Carrier Ultra Magnus, Tactician Prowl, Pursuit Vehicle Prowl, Stoic Strategist Ratchet, Field Medic Ratchet, Rescue Racer Jetfire, Air Guardian Jetfire, Ingenious Scientist Blitzwing, Adaptive Assailant Blitzwing, Cruel Tormentor Starscream, Power Hungry Starscream, Seeker Leader Slicer, High-Speed Antagonist Slicer, Hired Muscle Blaster, Combat DJ Blaster, Morale Booster Cyclonus, Cybertronian Fighter Cyclonus, the Saboteur Flamewar, Brash Veteran Flamewar, Streetwise Operative Goldbug, Humanity's Ally Goldbug, Scrappy Scout Megatron, Destructive Force Megatron, Tyrant Optimus Prime, Autobot Leader Optimus Prime, Hero Soundwave, Sonic Spy Soundwave, Superior Captain Ultra Magnus, Armored Carrier Ultra Magnus, Tactician

Iymrith, Desert Doom Iymrith is a beast: a 5/5 flyer is extremely strong, but add in card draw and protection and you have an immaculate top-end threat
The Pokemon Company does not publish official pull rates for Japanese sets
A widely cited estimate for Enchanted is roughly one per 96 packs on average