Omen, Storm's Emissary

Flash, Omen, Storm's Emissary can't be blocked.
Whenever Omen, Storm's Emissary or another permanent with flash enters the battlefield
under your control, you may pay 1 life. If you do,
draw a card, then discard a card.
—
Omen appears in a bolt of light ahead of the storm.
Each who glimpse it claim to see a different image,
though its advent always presages madness.