Basic lands come in six types, with each of the six producing a different type of mana when tapped: Plains produce white mana, Islands produce blue, Swamps produce black, Mountains produce red, Forests produce green, and Wastes produce colourless (and are much, much less common than the other five, having only appeared in one set)
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It might not seem like a lot since three mana isnt a huge commitment, but it can mean the difference between playing just one creature face-down and passing, and playing a creature face-down and then being able to flip it back over before your next turn
[1] If you control a Fusion Monster that must be Special Summoned with "Dark Fusion", you can Special Summon this card (from your hand)
While their other effects are powerful, the fact that they can be used on the opponent's graveyard means they're great for disruption
Pikachu VMAX #188 Pokemon Vivid Voltage Keep track of your collection value over time