Cliff Authority Retainer, Blockade Ganga

[G guardian] (Usable when both fighters' vanguards are grade 3 or greater, and the number of face up G guardians in your G zone is three or less)-Opponent Turn's Guard Step-[Choose a card with "Heal" from your hand, and discard it] Call this card to your (GC) from face down.
[AUTO]: [Choose one of your rear-guards, and retire it] When this unit is placed on (GC), you may pay the cost. If you do, this unit gets [Shield]+10000 until end of that battle. Choose up to two of your rear-guards, and until end of turn, they get "[AUTO]:When this unit is retired, return this card to your hand." .