Seal Dragon Prison Guard, Atar (G-BT11/035EN) [Demonic Advent]

[CONT]: Sentinel [AUTO]:[Counter Blast (1)-card with "Seal Dragon" in its card name] When this unit is placed on (GC) from hand, you may pay the cost. If you do, call five cards from the top of your deck to (GC). [AUTO](Drop Zone):[Choose another card with the sentinel ability from your drop zone, and put it on the bottom of your deck] When your opponent places a grade 2 unit on (RC) by the effect of your card, you may pay the cost. If you do, return this card to your hand.