[CONT]:
Sentinel
[AUTO]:[Choose a card from your hand, and discard it] When this unit is placed on (GC) from hand, you may pay the cost. If you do, choose one of your units that is being attacked, and it cannot be hit until end of that battle.
[AUTO]
Thunderstrike 4
(This ability is active when your opponent's bind zone has four or more cards)
:When this unit is retired from (GC), you may draw a card.