Dark Sective Processor

Spherical
Spells you cast of the chosen color gain "When
you cast this spell, put a -1/-1 counter on target creature"
{t}, {7}: Exile each card from each player's hand. You may cast these spells this turn, and instead
of paying colored mana, only use mana of the chosen color. At the end of the turn each player draws 7 cards.