Helm of Avigdor

Upgraded unit has "On attack, put the bottom card of your deck into your bank."

If you have 8 or more cards in your bank, upgraded unit has +3/+3 and if the upgraded unit is destroyed, you may put Helm of Avigdor into your hand.

“For centuries, it sat within Nehemiah's chambers as a reminder of those early days. A symbol of humility for those who take the name of Nehemiah.”