Vigorspore Wurm
Creature — Wurm
Undergrowth — When Vigorspore Wurm enters the battlefield, target creature gains vigilance and gets +X/+X until end of turn, where X is the number of creature cards in your graveyard.
Vigorspore Wurm can't be blocked by more than one creature.
イラスト：
Guilds of Ravnica#147コモン英語適正
裁定
Because tokens aren’t cards, they never count for undergrowth abilities.
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.
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.