Elven Tinkerer

Defender
Whenever Elven Tinkerer enters the battlefield
or blocks, you may have target opponent create
a 0/1 green Plant creature token. When you do,
create a 0/0 colorless Construct creature token
with "This creature gets +1/+1 for each plant
on the battlefield."
{x}{g}, {t}: Exile X target plants. When
you do, gain X life.