yugioh shaddoll card sleeves Shadows over Valhalla Secret Rare Fusion SHVA-EN057 If your opponent controls a monster(s) that was Special Summoned from the Extra Deck Card sleeve - Yugipedia

A bit easier to find although still very rare is the 2002 card released in Legend of Blue Eyes White Dragon set

This contrast is the point

With a Collector Booster included, it might just be one of the easier ways to get hold of one of the pricey packs with a discount from Amazon

GR Gold Rare Number 101: Silent Honor ARK X WATER Rank 4 [ AquaXyzEffect ] ATK 2100 DEF 1000 2 Level 4 monsters You can detach 2 materials from this card, then target 1 Special Summoned monster your opponent controls in face-up Attack Position

The four elemental boss monsters were generic, spammable dragons that could fit into just about any elemental deck of the time, summoned from the deck by their smaller counterparts and able to bring themselves back into battle at a near-relentless pace

Magic is full of cards that can do that - everything from Hardened Scales to Cryptic Trilobite can fulfill those conditions one way or another