Somewhat early in design, someone submitted a punisher card, punisher' being slang for cards that forced your opponent into a choice between two bad things. This was a great flavor for villains, who love nothing more than forcing heroes into ugly choices
There was some chance that a combination of art and explaining it to people would solve the confusion, but we only have that option with our most enfranchised players
Cost reduction cards like Jhoira's Familiar, Voyager Quickwelder, and Urza, Lord Protector also synergize well with colorless cards because they can reduce generic costs to 0, making colorless cards free to cast
It is entirely up to you
In some cases, such as if you're casting it from exile, it won't be much of a surprise to your opponent, but that's okay
Manglehorn First there was Uktabi Orangutan, then came Viridian Shaman, and now we get a huge upgrade to this card template with Manglehorn