It is lovely when you can kill some Titan without paying six life and getting to draw a card but far more often you are taking extra hits because you have to build up your goblin count before Gempalm even does anything
@Air Power, thanks for the elaboration -- so it's errata as text correction/clarification rather than as change
All of that said, while I would expect this Swords to be worth somewhere in the neighborhood of $15-$30, MTG players had a rather strong reaction to the cards artwork due to a debatable flavor fail
During each player's turn, that player may play a land or cast a spell from among cards exiled with this enchantment, and they may spend mana as though it were mana of any color to cast that spell
Splash only when you have at least two reliable sources of fixing, and only when the splash meaningfully increases your overall card quality
Quandrix Unlimited and yet you should discount it at your peril