I just prefer not to be flashing in my cards mid-combat
If one of these lands enters the battlefield under your control and you control zero, one, or two other lands, it enters the battlefield untapped
Filigree Vector Filigree Vector contributes lots of different effects to a wide variety of archetypes
Enters the battlefield tapped and can tap to provide either a blue or a black mana
Kruphix lets you preserve mana through phases and turns, keeping it colorless for as long as it stays on the battlefield
Pinkie Pie looks for smiles in art and party effects, Princess Twilight Sparkle cares about creature types, Rainbow Dash looks for haste and flying, Rarity and Applejack care about toys, and Fluttershy looks for tails