Rune Sigil of Madness

When Rune Sigil of Madness enters the battlefield, return target permanent to its
owner's hand, then that player discards
a card.
{t}: Add {u} or {b}.
Pay 1 life: Add {u}{b}. Activate this ability only once each turn.
"It sits, waiting for a touch to unleash the
hungry madness it contains within."