Forum:End phase questions involving spirit monsters?

alright, as everybody knows, spirit monsters return to the hand at the end phase but traps (including continuous) can be activated anytime after it's been set for one turn. this is a question that's been bothering me for long time. if i have ultimate offering on the field and tsukuyomi returns to my hand at the end phase, can i activate ultimate offering and summon tsukiyomi again during my end phase and because it was summon, can i activate her effect again? and if i could, because it is the end phase tsukuyomi returns to my hand can i repeat it until i run out of LP?