Shadowless cards were printed during the initial run of Base Set before the drop shadow was added to the card border in subsequent print runs, making them identifiable by their slightly different border design and, most importantly, the absence of the shadow that gives the variant its name
Even though the attack puts Cleffa to sleep, its Sweet Sleeping Face ability prevents it from taking damage until it wakes up
This is an artifact that stays in the bin and that makes it one of the top handful of cards for all round general cheat in shenanigans goodness
This sees play in most aggressive Blue decks or Blue/Red Spells decks
Gyruda was another card that was the centerpiece of multiple decks in Standard, Pioneer, and Legacy, each time fueling some sort of busted combo
Take the card in your hands The first test might seem a bit silly, but it's not