Miasmatic Undergrowth

{t}: Add {b} or {g}. You get a poison counter.
{b}{g}: Miasmatic Undergrowth becomes a 2/1
black and green Plant creature with shadow
and infect until end of turn. It's still a land.
"I can hold off the fog-bite, but you are responsible
for your own safety."
—Final clause, wind mage's travel contract