With Knights, trash down to gaining Knight, village Knight, trashing Knight, and cantrip Knight (Using trashing Knight). On the final trash for trashing Knight, it gets trashed by another knight.
Finally, use village Knight, getting it trashed by another Knight, use gaining Knight to gain the last Embargo for the 3- pile (getting trashed), use cantrip Knight, getting it trashed and drawing the Embargo. Use Embargo.
This can also be done by (all knights being trashed after use): village Knight, gaining Knight for any card that 3- piles, watchtower trash, use trashing Knight to trash watchtower.