Paying 1B for a 1/1 slug is pretty boring
Sword of the Ages Starting off with a colorless version of fling, I cant actually imagine a worse version than Sword of the Ages without just straight-up making it cost a billion mana or so
For example, you can exile a card with suspend that has no mana cost or requires a target even if no legal targets are available at that time
Pikachu Illustrator is one of the rarest Pokmon cards in existence, with copies selling for upwards of $200,000
Ramos, Dragon Engine, on the other hand, can only go in 5-color decks since it has all five types of mana pips in its rules text, despite having a colorless cost
Urabrask is a card that Ive often found myself wanting in more decks the more I play it