Activated abilities of creature cards in your graveyard cost less to activate.
Tap an untapped Zombie you control: Target player mills a card.
"They might be dead, but these mummies are masters of their trade."
—Jace Beleren
(18/04/2017)
Activated abilities contain a colon. They’re generally written “Cost: Effect.” Some keyword abilities (such as embalm) are activated abilities and will have colons in their reminder text.
(18/04/2017)
Any untapped Zombie you control can be tapped to pay the second ability’s activation cost, even one that just came under your control.
(18/04/2017)
You can’t normally activate abilities of cards in graveyards. Those that you can activate are those that instruct you to move the card out of a graveyard, or those that specifically say that you can activate them if the card is in your graveyard.
