Meeting of the Five

Exile the top ten cards of your library. You may cast spells with exactly three colors from among them this turn. Add {W}{W}{U}{U}{B}{B}{R}{R}{G}{G}. Spend this mana only to cast spells with exactly three colors.

Magic Online Promos

For years, the five families ruled New Capenna in uneasy peace, and the city prospered.

Streets of New Capenna Promos

Streets of New Capenna

The mana created by Meeting of the Five can be spent on any portion of the cost for a spell with exactly three colors, including any generic cost component or additional costs it has.

You may cast any spells that have exactly three colors from among the cards exiled this way, even if they aren't the same three colors. For example, you could cast a spell that is white, blue, and black, then cast a spell that is black, red, and green.