The triggered ability will resolve before Old Stickfingers does. If Old Stickfingers is countered in response to its own triggered ability, you will still follow all the instructions of the triggered ability, using the chosen value of X.
2021-09-24
The ability that defines the power and toughness of Old Stickfingers functions in all zones, not only while Old Stickfingers is on the battlefield. While Old Stickfingers is in a graveyard, the ability will count Old Stickfingers itself, presumably using a single, withered stickfinger.
When you cast this spell, reveal cards from the top of your library until you reveal X creature cards. Put all creature cards revealed this way into your graveyard, then put the rest on the bottom of your library in a random order.
Old Stickfingers's power and toughness are each equal to the number of creature cards in your graveyard.
