Young Wolf

Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)

Jungle Hollow

Jungle Hollow enters the battlefield tapped.
When Jungle Hollow enters the battlefield, you gain 1 life.
{T}: Add {B} or {G}.

Life Goes On

You gain 4 life. If a creature died this turn, you gain 8 life instead.

Forest

Nest Invader

When Nest Invader enters the battlefield, create a 0/1 colorless Eldrazi Spawn creature token. It has "Sacrifice this creature: Add {C}."

Tragic Slip

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.

Echoing Decay

Target creature and all other creatures with the same name as that creature get -2/-2 until end of turn.

Awoken Demon

Ecstatic Awakener

{2}{B}, Sacrifice another creature: Draw a card, then transform Ecstatic Awakener. Activate only once each turn.

Ecstatic Awakener // Awoken Demon

Bone Picker

This spell costs {3} less to cast if a creature died this turn.
Flying, deathtouch

Serene Heart

Swamp

Bayou Groff

As an additional cost to cast this spell, sacrifice a creature or pay {3}.

Rancor

Enchant creature
Enchanted creature gets +2/+0 and has trample.
When Rancor is put into a graveyard from the battlefield, return Rancor to its owner's hand.

Carrion Feeder

Carrion Feeder can't block.
Sacrifice a creature: Put a +1/+1 counter on Carrion Feeder.

Brindle Shoat

When Brindle Shoat dies, create a 3/3 green Boar creature token.

Witherbloom Campus

Witherbloom Campus enters the battlefield tapped.
{T}: Add {B} or {G}.
{4}, {T}: Scry 1.

Village Rites

As an additional cost to cast this spell, sacrifice a creature.
Draw two cards.

Nihil Spellbomb

{T}, Sacrifice Nihil Spellbomb: Exile target player's graveyard.
When Nihil Spellbomb is put into a graveyard from the battlefield, you may pay {B}. If you do, draw a card.