1) Heartbeat of Spring ( Champions of Kamigawa ) During the development of Fifth Edition (back in something like 1997), the team made of wish list of cards it wanted to see in future base sets
9 Jumbo Cactuar Has Deadly Potential With The Right Buffs Providing An Easy Target To Distract Your Opponents Although Jumbo Cactuar raised plenty of controversy when it was first released, it's not a broken card by any means on its own
You have a 1 in 3 chance at a foil from that same formulation, so whatever infinitesimal chance you had at a borderless mythic rare from that slot in a Set Booster, take those odds and multiply by .33 to get your odds in a Draft Booster
Like Sol Ring and Arcane Signet, this shows up in most preconstructed decks, and is a perfectly serviceable form of ramp
Then it deals double damage to anything not just the player it smashes, so you might want to put this on your Commander for a free Commander Damage out of nowhere, don't sleep on that