This is because, unlike the packs you'll select afterwards, the cards you get from your very first booster pack are set depending on your choice between Charizard, Pikachu or Mewtwo
The floor on Mystic Confluence is drawing three cardsessentially a Jace's Ingenuitywhile the ceiling is a three-for-one when you can Mana Leak an important spell, bounce one of your opponent's creatures (or even your own Snapcaster Mage), and draw a card along the way for good measure
He proceeded to go on an absolute tear in Standard, finishing the Swiss rounds with a 10-2 constructed record
Even squirrels were once considered too silly fun black-boarder and confined to an Un-existence
In the past with just Kuldotha Rebirth it usually wasnt worthwhile since your odds of drawing a Kuldotha Rebirth wasnt especially high and cards like Ornithopter and Memnite are pretty bad if they aren't turning into three 1/1 Goblin tokens, but now the odds are in favor of having one in hand every game