Regalia of Frost, Jotun

:Sentinel :[Choose a card from your hand, and discard it] When this unit is placed on from hand, you may pay the cost. If you do, choose one of your units with "Regalia" in its card name, and it cannot be hit until end of that battle. :[Bind this card face up] When this card is put into the drop zone from your soul during your turn, if you have a vanguard with "Regalia" in its card name, you may pay the cost. If you do, choose a "Regalia of Frost, Jotun" from your drop zone, and you may return it to your hand.