Lens Mosquito

Lens Mosquito enters the battlefield as a giant
(4/6) until after your next turn. After which, it
reverts to a (1/X), where X is the number of
green lands you have on the board, minus 1.
{t}{g}{g}: Poison a target creature, reducing its toughness by 1. Activates once for two turns.
If it was as huge as it looked in the camera,
start running.