To make things even better, Grasp of Darkness is an instant, meaning that we can accrue big advantages by using it during combat or simply find other ways to put our mana to work when that killable threat on the other side of the table just hasn't been played yet
So with exile target permanent, and then return it to the battlefield under your control being so lengthy, why hasnt it been replaced with flicker or blink as an official keyword
For this ranking, I mainly focus on cards that have flashback themselves, and leave out most cards like Snapcaster Mage that give this static ability to instants and sorceries in your graveyard
Check out the odds of the rarest cards below, using the Genetic Apex packs as an example: Crown Charizard EX, Crown Pikachu EX, Crown Mewtwo EX 0.04 per cent chance: 0.013 per cent per card (4th card, regular pack)
The ramp here is exceptional overall: we've got a lot of 2-drops, with standouts including Vedalken Engineer and Etherium Sculptor