Venom

Symbiosis {1}{b/g}{b/g}{g/u}
Reach, trample, deathtouch
Venom must be blocked if able.
If a creature that was dealt damage by Venom dies, put X +1/+1 counters on Venom where X
is the power of the creature that died.
Whenever Venom dies, choose a creature, if
you don't control it gain control of it and becomes a copy of Venom.