Mausoleum Secrets
Instant
Undergrowth — Search your library for a black card with mana value less than or equal to the number of creature cards in your graveyard, reveal it, put it into your hand, then shuffle.
Adam Paquette
Guilds of Ravnica (GRN)
• #75Rulings
Creature cards with other types, such as artifact creature cards, count for undergrowth abilities.
(wotc • 2018-10-05)
If a card in your library has {X} in its mana cost, X is considered to be 0.
(wotc • 2018-10-05)
Because tokens aren’t cards, they never count for undergrowth abilities.
(wotc • 2018-10-05)
A land card that produces black mana, even a Swamp, normally has no color.
(wotc • 2018-10-05)
Rulings
Creature cards with other types, such as artifact creature cards, count for undergrowth abilities.
(wotc • 2018-10-05)
If a card in your library has {X} in its mana cost, X is considered to be 0.
(wotc • 2018-10-05)
Because tokens aren’t cards, they never count for undergrowth abilities.
(wotc • 2018-10-05)
A land card that produces black mana, even a Swamp, normally has no color.
(wotc • 2018-10-05)