Conjuro
Converger — Exilia el permanente objetivo que no sea tierra si su valor de maná es menor o igual que la cantidad de colores de maná usados para lanzar este hechizo.
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.