Soul Shackle

Soul Shackle stays in the arena until it is destroyed. Banishing the top card of your deck does not destroy Soul Shackle.

The effect is not optional. You must banish the top card of your deck if able.

Soul Shackle is a trigger that happens at the beginning of the action phase. Players can respond to it.

If you have no cards in your deck, you do not lose the game. You would not be able to banish any cards from the top of your deck but the ability would still resolve.