Owlbear Shepherd

At the beginning of your end step, if creatures you control have total power 8 or greater, draw a card.

Alchemy Horizons: Baldur's Gate

When your pack is nowhere to be found, you form a new one.

Commander Legends: Battle for Baldur's Gate

Owlbear Shepherd's ability has an intervening if clause, which means that it checks to see if creatures you control have total power 8 or greater both as it would trigger and as it resolves. If enough creatures have been removed or their total power is reduced to below 8 by the time the ability tries to resolve, you will not draw a card.