Swarm of rotten flies

When this card enters the battlefield attach it to a
green creature equiped creature gets 0/-1 and
''When the equipped creature damages another creature put one couter -1/-1
on that creature if you damage another player put
one counter of poison on it instead''
When equipped creature is destroyed destroy
this card and put in battlefield one
fly green token 1/1 with flying and infect
Equip {1}