Spellcraft is an unreleased Super Nintendo conversion of the original Spellcraft RPG / Strategy Game that was released for the PC in 1992. This port was in development by Ybarra Productions / Ascii and as we can read on Wikipedia, it is very different than the PC version as it focuses on adventuring instead of strategy. A playable, almost complete ROM of Spellcraft SNES was somehow leaked online and it should be easily findable through Google. The game was probably cancelled for quality issues.
Thanks to Celine for the contribution! (Scan from Super Power issue #7 and #12)