Sorcerous Squall costs a staggering nine mana, which becomes much easier to cast since you can exile cards from your graveyard to help pay for the cost with the delve ability
First, the Forest cards it fetches come in untapped (barring other clauses), which means you can use that mana immediately effectively reducing its net cost to 2 mana during the turn you play while ramping you by 2 lands for the rest of the game
The other Infinity Stones are expected to make their cardboard debuts in later Marvel sets like Marvel Super Heroes, likely along with some payoff for assembling them all, so any players with the means to do so are picking up their copies of The Soul Stone now while its relatively inexpensive
Being played mostly in UW Control and some sideboards, the card never really picked up that much of an archetype enabler, unlike in Legacy in which its the go-to card in combination with Ancient Tomb against Brainstorm and Lions Eye Diamond strategies
2022, Alchemy: Dominaria dropped as a 30-card expansion to the digital format as the Standard verison's companion set just a month later