, Mill a card: Add . (Activate only as an instant. To mill a card, put the top card of your library into your graveyard.)
"Another failure," grumbled the toymaker. She slammed the door with such gusto that she failed to notice the eyes watching her.
(08/12/2022)
If an effect allows you to look at the top card of your library any time or to play with the top card of your library revealed, and you activate Millikin's mana ability while casting a spell, you can't look at the new top card of your library until you are done casting the spell. The same is true if you activate Millikin's ability while activating another ability.
(05/08/2026)
Millikin’s ability is not a mana ability. Players can respond to it, and it can’t be activated in the middle of paying for a cost. A recent update to rule 605.1a has made any abilities that move cards to or from libraries no longer mana abilities.
