In the rare case that you control multiple Army creatures (perhaps because you played a creature with changeling) while you amass Orcs, you choose which of your Army creatures to put the +1/+1 counters on. If that creature isn't an Orc, it becomes an Orc in addition to its other types.
Sauron, Lord of the Rings
The creature card you choose doesn't need to be a card you milled. You may choose a creature card that was already in your graveyard before you milled.
Sauron, Lord of the Rings's last ability will trigger even if the owner of the commander that died chooses to return it to the command zone after it dies.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Alex Brock
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
