Because then blitzball was unlocked
When Minsc & Boo, Timeless Heroes enters the battlefield and at the beginning of your upkeep, you may create Boo, a legendary 1/1 red Hamster creature token with trample and haste.+1: Put three +1/+1 counters on up to one target creature with trample or haste.2: Sacrifice a creature
Without that, almost regardless of age, the lowest priced sets tend to hover below $100, like Fallen Empires , Fate Reforged , and Dragons Maze
Its colorless, and it gives you a spell from the discover ability the turn you cast it, so its fast enough
As it happens, casting this early with fast mana means you constantly restock your hand to seven every turn with basically no downside - especially if you could gain life back in the process