Ganivaar, Born of Colossi

When Ganivaar enters, sacrifice a land, then put
a +1/+1 counter on each other creature you
control.
Barbarians, Elementals, and Giants you control
have trample and haste.
Whenever one or more +1/+1 counters are placed
on a creature you control, Ganivaar gets +0/+1
and gains reach until end of turn.
Whenever a Forest enters the battlefield,
Ganivaar gets +2/+0 until end of turn.
{g}{g}, {t}: Proliferate.