Effect Grammar/help anyone is welcome

[.Requiem]

Yea here is a effect on working on and I don't if any of it wrong or not. So can anyone help?

 

Effect:

This card cannot be destroyed as a result of battle. Once per turn during your Standbyphase while this card is face-up on the field. The owner of this card may special summon one 3 star monster or lower to face-up ATK position.

[Catman25]

This card cannot be destroyed by battle. Once per turn during your Standby Phase, you can special summon one monster level 3 or lower in face-up attack position. I'm not sure if it's right, but that's how I would put it.

[moneypony]

This card cannot be destroyed as a result of battle(damage claculation applied normally). Once per turn,during your each of your standby phase,you may special summon one level 3 or lower monster to your side of the field in face up attack position.

i dont know if it's correct but i think it's better than catman's.although i never really make cards.