Effect is only active the turn he is Synchro summoned.
Destroyed by Battle
Since you will not take damage, you can keep crashing your monsters into your opponent to trigger effects. Monsters like Troop Dragon and Peten the Dark Clown can be repeatedly crashed into your opponent’s monster to thin your deck.
The turn you summon Powered Inzektron is the turn you can safely activate cards effects with have some risk of dealing damage to you. You can use Destruction of Destiny to load your graveyard without worrying about damage. Where Arf Thou? searches your deck for a level-1 monster and you will not receive damage even if you do not summon the monster. You can safely get rid of your Aegis of Gaia on the field to permanently keep your gained LP.