Tazri, Stalwart Survivor — March of the Machine: The Aftermath Promos #6p

Each creature you control has ": Add one mana of any of this creature's colors. Spend this mana only to activate an ability of a creature. Activate only if this creature has another activated ability."

, : Mill five cards. Put all creature cards with activated abilities that aren't mana abilities from among the milled cards into your hand.