Feitiço
Convergir — Exile a permanente alvo não de terreno se o valor de mana dela for igual ou inferior ao número de cores de mana gasto para conjurar esta mágica.
Unless a spell or ability allows you to, you can't choose to pay more mana for a spell with a converge ability just to spend more colors of mana. Likewise, if a spell or ability reduces the amount of mana it costs you to cast a spell with converge, you can't ignore that cost reduction in order to spend more colors of mana.