Extraplanar Lens can turn a basic-heavy mana base into a much larger resource engine. When it enters, you may exile a land you control. Lands with the same name then produce an additional mana of a type they produced whenever they are tapped for mana. Imprinting a basic land can improve many future land activations at once.
Mono-color decks are the natural home. A deck full of Islands or Swamps can make the investment pay off quickly, especially when it wants to cast expensive spells or activate large mana sinks. The effect cares about the exact land name, so Snow-Covered Island and Island are different names for this purpose.
The bonus is not limited to your lands. Opponents with matching land names receive extra mana too. Using snow-covered basics may reduce how many opposing lands match, but it does not guarantee a one-sided effect. Consider the other mana bases before deciding whether the acceleration helps you more than the rest of the table. Exiling a land also creates a real setup cost. If the Lens is removed, the imprinted land does not return automatically, leaving you down both the artifact and a land. Deploy it when you can use the extra mana promptly or protect the engine. A deck with many different nonbasic names will usually get less value than one built around a large number of matching basics and a clear reason to spend the extra mana.
