Golden age (If you cast an instant or sorcery spell, activated a nonmana ability, and attacked this turn, enter a renaissance for this game.) {T}: Add {C}. If you're in a renaissance, add one mana of any color instead. {3}, {T}: Scry 1.
Field of Obelisks enters the battlefield tapped. As Field of Obelisks enters the battlefield, choose a color other than white. {T}: Add {W} or one mana of the chosen color.
Firehearth Halls enters the battlefield tapped unless you control a basic Mountain. {T}: Add {R}. {R}{R}: Firehearth Halls becomes a 1/1 red Dwarf Warrior creature with double strike until end of turn. It's still a land.
As Flooded Depths enters the battlefield, you may pay 2 life. If you don't, Flooded Depths enters the battlefield tapped. {T}, Sacrifice Flooded Depths: Search your library for an Island or Swamp card, put it onto the battlefield, then shuffle.
Flourishing Forest enters the battlefield tapped. As Flourishing Forest enters the battlefield, choose a basic land type. Flourishing Forest is the chosen type in addition to its other types.
Flourishing Island enters the battlefield tapped. As Flourishing Island enters the battlefield, choose a basic land type. Flourishing Island is the chosen type in addition to its other types.
Flourishing Lowlands enters the battlefield tapped. {T}: Add {G}. Desertcycling {1}{G}({1}{G}, Discard this card: Search your library for a Desert card, reveal it, and put it into your hand, then shuffle.)
Flourishing Mountain enters the battlefield tapped. As Flourishing Mountain enters the battlefield, choose a basic land type. Flourishing Mountain is the chosen type in addition to its other types.
Flourishing Plains enters the battlefield tapped. As Flourishing Plains enters the battlefield, choose a basic land type. Flourishing Plains is the chosen type in addition to its other types.
Flourishing Swamp enters the battlefield tapped. As Flourishing Swamp enters the battlefield, choose a basic land type. Flourishing Swamp is the chosen type in addition to its other types.
As Flourishing Waterways enters the battlefield, you may reveal a Forest or Island card from your hand. If you don't, Flourishing Waterways enters the battlefield tapped. {T}: Add {G} or {U}.
{T}: Add {C}. {T}, Sacrifice Fluctuating Locale: Rediscover a land card. (Look at the top card of your library. You may reveal it and put it into your hand if it's a land card. Otherwise, put it back or into your graveyard.)
As Foreboding Ruins enters the battlefield, you may reveal a Swamp or Mountain card from your hand. If you don't, Foreboding Ruins enters the battlefield tapped. {T}: Add {B} or {R}.