Clockwork General

As long as it is your combat phase, creatures you control named Clockwork Soldier have Indestructible.
{5}, {t}: Switch the power and toughness of each creature you control named Clockwork Soldier
until end of turn.
{t}, Sacrifice 10 Clockwork Soldiers: Take an extra
turn after this one. Creatures you control named Clockwork Soldier do not untap during the untap
step of this turn.