list of illegal yugioh cards that are banned in the tcg but legal in master duel : r/yugioh Banlist : r/yugioh

Mew EX Full Art

Wizards will change its name to Spacegodzilla, Void Invader on its digital platforms and will not reprint Spacegodzilla, Death Corona in future printings of Ikoria draft boosters

The updated card art for Ho-Oh and Lugia's immersive variants can now be seen within Pokmon TCG Pocket, replacing the temporary artwork the game hurriedly switched to last week as fan complaints boiled over, and the game's developer was forced to subsequently appeal for calm

So to boil it down, Dash is an alternate cost that gives the permanent with it haste but will then return back to hand at the end of the turn

Ive never heard of a modern example of this, just people recalling from their childhood