The tower of Isengard

Tower of Isengard has indestructible as long as you control 3 or more orcs.
when tower of isengard enters the battlefield, create a 2/2 red and black orc creature tokens equal to the number of orcs you control.
at the beginning of your upkeep, sacrifice 2 orcs. If you can't, sacrifice tower of Isengard.
Orcs you control have +1/+1
{t}:create a 2/2 black and red orc creature token
{1}{b}{r}: create a 2/2 black and red orc creature token