Channel During Saviors of Kamigawa , we decided to do a number of cards that you could sacrifice from your hand for mana to generate an effect, usually tied thematically in some way to the base ability of the card
A card like Elvish Mystic has to wait a turn until it can attack or be tapped to create green mana, but a card like Goblin Smuggler can attack the turn you cast it or use its tap ability that reads another target creature with power two or less cant be blocked this turn. Vigilance A creature with vigilance doesnt tap when it attacks
Well, besides the ink not easily coming off the cards today
So to nail one of these, its 1/26 for a specific rare and 1/52 for a specific mythic
Cacophodon Cacophodon is a 2/5 for 4 mana, which is a good size to survive red sweepers
Cards like Mega Gardevoir EX and Mega Charizard EX brought that Mega Dream energy with big attacks and risky plays