Imperium Colossus

Menace, Vigilance
Overclock 6 (As an additional cost to cast this
creature, you may pay up to 6 {e}. For every {e} paid
this way, this creature enters the battlefield with an additional +1/+1 counter).
{e}{e}{e}{e}: Put a +1/+1 Counter on Imperium
Colossus. It gains Indestructible until end of turn.