Trevor, Champion of Crosis

Whenever you discard a card, Trevor, Champion
of Crosis deals 1 damage to target creature.
{u}{b}{r}{t}: Draw a card. Then you may discard a
card. When you do Trevor, Champion of Crosis
deals X damage to target creature, and its
controller loses X life, where X is the cards
converted mana cost.
"Why is pioneer a format, because Phyrixian mana is
a mistake."