Escort Dragon Attendant, Reas

: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 vanguards that is being attacked, and that unit cannot be hit until end of that battle. /:Blaze (At the beginning of each of your attacks, if you have more rear-guards than your opponent, your vanguard becomes blazing until end of turn) : 1 At the end of the battle that this unit boosted ([Boost]), if your vanguard is blazing, you may pay the cost. If you do, return this unit to your hand.