Festering Fingerprint, Vyke

Haste, First Strike, Invader (whenever a creature
with Invader attacks, you chose target creature an opponent controls to block it. It can't be blocked by
more than one creature.)

Boast—{b}{r}: Draw a card.

Whenever Festering Fingerprint Vyke attacks, you
may discard a card. If you do Vyke gets +X/+0
until end of turn where X is the discarded cards
mana value.