Naaria, Soul of the Earth

Indestuctible, Trample
Naaria, Soul of the Earth isn't a creature unless you control 5 or more forests.
You gain 2 life at the start of your turn.
Whenever a creature enters the battlefield under an opponents control, that creature gets -1/-1 until end of turn, and whenever a creature enters the battlefield under your control, that creature gets +1/+1 until end of turn.