Undergrowth — Target creature gets -X/-X until end of turn, where X is the number of creature cards in your graveyard. If that creature would die this turn, exile it instead.
The assassins of the Ochran distill toxins from the remains of their previous victims.
If you have no creature cards in your graveyard, the target creature gets -0/-0, and it will still be exiled if it would die this turn.
05-10-2018
wotc
Necrotic Wound's replacement effect will exile the target creature if it would die this turn for any reason, not just immediately after Necrotic Wound resolves.
05-10-2018
wotc
The value of X is determined only as the undergrowth ability resolves. If the number of creature cards in your graveyard changes later in the turn, the target creature is unaffected.
05-10-2018
wotc
Creature cards with other types, such as artifact creature cards, count for undergrowth abilities.
05-10-2018
wotc
Because tokens aren't cards, they never count for undergrowth abilities.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.