Keyword: Morbid

Target creature gets -1/-1 until end of turn.
Morbid — That creature gets -13/-13 until end of turn instead if a creature died this turn.

Morbid — When Ulvenwald Bear enters the battlefield, if a creature died this turn, put two +1/+1 counters on target creature.

Put a +1/+1 counter on target creature.
Morbid — Put three +1/+1 counters on that creature instead if a creature died this turn.

Target creature gets -1/-1 until end of turn.
Morbid — That creature gets -13/-13 until end of turn instead if a creature died this turn.

Target player discards two cards.
Morbid — If a creature died this turn, instead that player reveals their hand, you choose two cards from it, then that player discards those cards.

Morbid — When Wakedancer enters the battlefield, if a creature died this turn, create a 2/2 black Zombie creature token.

Trample
Morbid — Gravetiller Wurm enters the battlefield with four +1/+1 counters on it if a creature died this turn.

Morbid — When Hollowhenge Scavenger enters the battlefield, if a creature died this turn, you gain 5 life.

Search your library for a basic land card, reveal it, put it into your hand, then shuffle your library.
Morbid — You may put that card onto the battlefield instead of putting it into your hand if a creature died this turn.

Reach (This creature can block creatures with flying.)
Morbid — Somberwald Spider enters the battlefield with two +1/+1 counters on it if a creature died this turn.

Flying
Morbid — At the beginning of each end step, if a creature died this turn, destroy target non-Demon creature.

Morbid — , Tap two untapped creatures you control: Create a 5/5 black Demon creature token with flying. Activate this ability only if a creature died this turn.

Morbid — When Morkrut Banshee enters the battlefield, if a creature died this turn, target creature gets -4/-4 until end of turn.

Morbid — When Woodland Sleuth enters the battlefield, if a creature died this turn, return a creature card at random from your graveyard to your hand.

Trample
Morbid — Festerhide Boar enters the battlefield with two +1/+1 counters on it if a creature died this turn.

Brimstone Volley deals 3 damage to any target.
Morbid — Brimstone Volley deals 5 damage instead if a creature died this turn.