Loch Larent is a uncommon Land card from Alchemy: Wilds of Eldraine (YWOE), collector number 30.
Loch Larent enters tapped. {T}: Add {U}. {1}{U}, {T}: Scry 3. Target opponent gets a one-time boon with "When you cast a creature spell, that creature enters tapped and with a stun counter on it." Activate only during your turn and only once.