
Creature — Wurm
Undergrowth — When this creature enters, target creature gains vigilance and gets +X/+X until end of turn, where X is the number of creature cards in your graveyard.
This creature can't be blocked by more than one creature.
6/4
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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.
If there are no creature cards in your graveyard, the target creature just gains vigilance until end of turn.
If Vigorspore Wurm gains menace, it can't be blocked at all.
Creature cards with other types, such as artifact creature cards, count for undergrowth abilities.
Because tokens aren't cards, they never count for undergrowth abilities.