Corrupted Grafstone
Artifact
This artifact enters tapped.
: Choose a color of a card in your graveyard. Add one mana of that color.
It is all too easy to disturb the Blessed Sleep.
Bastien L. Deharme
Shadows over Innistrad (SOI)
• #253Rulings
Players can't respond to mana abilities, so no player can take any action to stop you from getting the color of mana you expect to produce once you announce the ability.
(wotc • 2016-04-08)
Colorless cards have no color, so you can't add {C} this way.
(wotc • 2016-04-08)
Rulings
Players can't respond to mana abilities, so no player can take any action to stop you from getting the color of mana you expect to produce once you announce the ability.
(wotc • 2016-04-08)
Colorless cards have no color, so you can't add {C} this way.
(wotc • 2016-04-08)