Serpent-Slayer

Infect
When Serpent-Slayer dies, put a contamination counter on a land you control. For as long as
that land has a contamination counter on it, it
has "At the beginning of your upkeep, you get
two poison counters."
"It's full of air, just spear it and let's go home."
—Gyllus, Neurok scout, last words