Gate to the Unknown

{t}: Add {r} mana to your mana pool. Activate this ability only if you have 1 or less cards in hand
{t}: Add {g} mana to your mana pool. Activate this ability only if you have exactly 2 cards in hand{t}: Add {w} mana to your mana pool. Activate this ability only if you have exactly 3 cards in hand{t}: Add {b} mana to your mana pool. Activate this ability only if you have exactly 5 cards in hand{t}: Add {u} mana to your mana pool. Activate this ability only if you have exactly 7 cards in hand