While the entire base set is iconic, some cards really separate themselves from the rest either due to nostalgia or simple rarity
For the most part, however, playtest card effects tend to stay as playtest cards
The Sample Pikachu e-Card uses the same artwork and card structure as Expedition s Pikachu #124/165, with the only differences being the number (#016/092), the copyright changing from just Pokmon to Pokmon / Nintendo and the inclusion of a large bolded Sample text in place of Expedition s set symbol
A lot of Spellslinger decks also run some sort of combo to produce multiple copies of spells
What breaks an MTG Pillow Fort Pillow Fort is an awesome archetype if you get it working, but there are a few things that usually stick a fork in your plans
Toothy, Imaginary Friend If you flicker Toothy, Imaginary Friend with a spell like Essence Flux that returns it to play instantly, Toothy returns to play before the draw trigger resolves