spheal pokemon card full art - 199/191 - Surging Sparks Common Retreat cost Lisia's Appeal and Pikachu ex

If it could be hybrid, it was uncommon, and if it wanted to be a traditional two-color gold card, it had to be rare

Combining this with the MTR's mention that drawing a card is a meaningful change, I think we can reasonably extrapolate this to any game variable changing, so a player gaining life or adding mana to their mana pool would also be a relevant change as long as the new value is likely to matter

Cards like High Tide or Extraplanar Lens amplify the mana boost, while finishers like Stormtide Leviathan take advantage of opponents being forced into islands

For the purposes of this article, a cards worth or value is defined as its TCGplayer low price -10%