pokemon 151 single booster pack Collect Surprise Slim Box (CN) you might even find the elusive Mew ex in your travels Pokemon 151 (JP): Booster Box

It's also one of the few cards that directly references the cleanup step, so there's that

Brute Bonnet Ability - Toxic Powder Once during your turn, if this Pokemon has an Ancient Booster Energy Capsule attached, you may make both Active Pokemon Poisoned

This is an easy trade-off for a 6-card start, especially when youve built your deck to take that handicap into consideration

The OG duals were so powerful they served as the reason for subsequent land cycles adding restrictions such as coming into play tapped or dealing damage when tapped for colored mana

Its not got the popularity of a bankable Pokmon like Rayquaza

The real purpose of the futureshifted cards was to point at potential mechanical and creative places we might go one day