Cards like High Tide or Extraplanar Lens amplify the mana boost, while finishers like Stormtide Leviathan take advantage of opponents being forced into islands
Standard commons and uncommons usually pay less than reverse holos, holo rares, and premium modern cards like V, GX, EX, VMAX, and VSTAR
Today, most counterfeit cards are designed to pass various tests like the bend test and the light test, and some look almost exactly like the real thing, even upon close inspection (unless you're going really deep and using a jeweler's loupe, which is a good way to weed out fakes but too much work for the average player)
And happy digging!
Join Rosemary Kelley for a look at how to increase its effectiveness, using the Pokmon TCG: Inteleon VMAX League Battle Deck as an example
That card has tanked since it was reprinted in the Creative Energy deck, though in fairness it does seem to have leveled off at about double its previous value