Ilharg, the Raze-Boar

If an effect exiles the God and immediately returns it to the battlefield, its last ability triggers but will have no effect. However, if an effect exiles it and would return it to the battlefield at a later time, the God's ability may return that card to its owner's library first. If it does, the effect that exiled it won't return it later.

If the new creature leaves the battlefield before the end step, most likely because it died in combat, that card remains in its current zone. It won't return to your hand.

If the new creature has an ability that triggers at the beginning of the end step, that ability will trigger and resolve even if the creature is returned to your hand during the end step before that ability resolves.