Can a card such as Elouith be triggered when your deck only contains 2 cards? Or similarly, triggering Canoptek Spyder to remove damage from a unit that has only 1 damage?
Battle: Search the top 3 cards of your deck for a card. Add it to your hand, and place the remaining cards on the bottom of your deck in any order.
Combat Action: During a battle at this planet, discard a unit card from your hand to remove 2 damage from a [Necron] army unit you control at this planet. (Limit once per combat round.)