Hall of Gemstone causes lands to produce mana of the chosen color instead of any other color. So you can either tap City of Brass for the chosen color, or you can try to produce a different color and Hall's effect will make it produce the chosen color anyway.
Second is there a card that absolutley hoses green like Karma does against black or Conversion does against red?
Asking for card suggestions isn't within the scope of the Rulings section of these forums. You should try Magic General or the format-specific section. (So as not to leave you empty-handed, Acid Rain and Deathgrip come to mind.)
First, he is extremely lucky in getting Hall of Gemstone out almost every game and we all play multi colored decks.
My first question is, how does Hall of Gemstone affect cards like City of Brass or Opal Palace?
Second is there a card that absolutley hoses green like Karma does against black or Conversion does against red?
My thanks ahead of time.
Asking for card suggestions isn't within the scope of the Rulings section of these forums. You should try Magic General or the format-specific section. (So as not to leave you empty-handed, Acid Rain and Deathgrip come to mind.)
Breath of Dreams
Dream Tides
Flooded Woodlands
Leshrac's Sigil
Nature's Ruin
Perish
Spam warning issued.
- Teia