You sacrifice the Mantle during the resolution of Incarnation's ability. The Mantle's ability triggers but can only be put on the graveyard after Incarnation's ability has resolved fully, so you will first find Tolsimir and put him on the battlefield, and only later the wolf tokens will enter the battlefield.
Do the mantle wolves get the life gain and fight ability from tolsimir?
You sacrifice the Mantle during the resolution of Incarnation's ability. The Mantle's ability triggers but can only be put on the graveyard after Incarnation's ability has resolved fully, so you will first find Tolsimir and put him on the battlefield, and only later the wolf tokens will enter the battlefield.