原文You don't choose a target for Saruman of Many Colors's ability at the time it triggers. Rather, a second "reflexive" ability triggers when one or more cards are milled this way. You choose a target for that ability as it goes on the stack. Each player may respond to this triggered ability as normal.
原文If you cast a spell "without paying its mana cost," you can't pay any alternative costs. You can, however, pay additional costs, such as kicker costs. If the card has any mandatory additional costs, you must pay those.