Grig From gates

If Grig wasn't cast sacrifice Grig.
Gatewalk (This creature can not be blocked as long
as defending player controls a gate)
Grigs power and toughness is equal to the
number of gates you control.
whenever a gate enters the battlefield under your control untap it.
{t} Add one mana that a gate you control can create.
If Grig is your commander you may have 3 additional gates in your library