Vren, the Relentless

Ward {2}
If a creature an opponent controls would die, exile it instead.
At the beginning of each end step, create X 1/1 black Rat creature tokens with "This creature gets +1/+1 for each other Rat you control," where X is the number of creatures that were exiled under your opponents' control this turn.

Bloomburrow Promos

Bloomburrow

Ward {2}
If a creature an opponent controls would die, exile it instead.
At the beginning of each end step, create X 1/1 black Rat creature tokens with "This creature gets +1/+1 for each other Rat you control," where X is the number of creatures your opponents controlled that were exiled this turn.

While Vren is on the battlefield, creatures your opponents control are exiled instead of dying, and abilities that trigger when a creature dies won’t trigger.

Cards that would go to your opponent’s graveyard for reasons other than dying, such as being discarded or milled, will still go to the graveyard and will not be exiled instead.

If Vren would leave the battlefield at the same time as one or more creatures an opponent controls would die, those creatures will still be exiled.

Vren’s last ability counts any creatures your opponents controlled that were exiled this turn, including creature tokens.