Dual lands are lands that can produce two different colors of mana through their mana abilities, which makes them a core part of multicolor deckbuilding
The Foil Loophole, Part Two In 2010, Wizards made use of the foil loophole in grand fashion
Unfortunately, at full speed of four, this card draw can wipe you out quickly but you've likely got enough firepower in your hand to end the game way before that
On the other side, Karn, Scion of Urza, Lyra Dawnbringer, History of Benalia, Mox Amber, Settle the Wreckage, and Walking Ballista are all on their way down
You may want to save it for later turns where you'll have mana to cast the card you exile, or you might want to see all your options first before making your move