If you control no monsters, you can Normal Summon this card without Tributing. When this card is Special Summoned, place 3 counters on it. This card cannot be destroyed by battle. If this card attacks or is attacked, remove 1 counter from this card at the end of the Damage Step. If you cannot, destroy it.
You can easily Normal Summon this card for say, Synchro purpose (since it won't have any counters if Normal Summoned, which means instantly destroyed by its own effect after it battles, even if it cannot be destroyed in the battle itself, so it's better to be instantly used as material)