Bituminous Blast was a superstar in both Block and especially Standard
3 Rarity symbol Next to the card number sits a small symbol: a circle (common), diamond (uncommon), star (rare), or a combination of stars for ultra rare, hyper rare, and special illustration rare
(2020-01-24) This ability triggers only on your very first spell during an opponents turn, not the first spell after the card is on the battlefield
Mew is fairly modest, hitting for 20 and revealing the opponents hand, but Mew ex has a Ditto-like ability to mimic any attack of your opponents active card, and for three Normal energy, meaning it can be used in any deck of any stripe
Then when I moved back to Oslo a few years later I discovered the truth
Keep in mind that playing lands from exile will still give you a Treasure if you have Prosper on the battlefield, so having a few more lands in the deck can actually be really helpful