Serrata, Infectious One

Lands you control have {1}: This land becomes a 1/1 green insect creature with infect until end of turn. It's still a land. (It deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)
{b/g}: Target creature gains infect until end of turn.
Whereever the devil spits, poison grows.