While its undeniably powerful, losing just this card could be a disaster for Sapphire
If your opponent has to kill your Esper Sentinel with something like Declaration in Stone or Lightning Strike for two mana, you are already winning the exchange, with your opponent having to trade down mana-wise
When the tough gets going, this card will aid a lot in battle
Alcove Flip Deck Boxes featuring the same artwork as the cards sleeves will also be available
And, unlike most other one and two-drop threats you might play, the delve creatures all dodge Fatal Push #23: Fatal Push Black is supposed to be the creature kill color, but for the longest time, the top of the lists were exclusively reserved for white and red cards
Otherwise, check your cards for obvious signs of wear and tear, such as scratches and peeling corners