Blue Storm Guardian Dragon, Icefall Dragon

[CONT]:Sentinel (You may have up to four cards in total with Sentinel in a deck)

[AUTO]:[Counter Blast (1)] When this unit is placed on (GC) from hand, if you have a "Aqua Force" vanguard, you may pay the cost. If you do, reveal five cards from the top of your deck. Call all "Aqua Force" to (GC) at [Rest] from among them, and put the rest into your drop zone.