Citadel of Dusk

Enchanted land gains "{p/b}{p/b}{t}: you may
move your commander from the command zone
or your hand into your graveyard.
You may cast your commander from your
graveyard as though it were the command zone,
except you must pay commander tax with
{p/b} {p/b} instead of {2}.
"The only loss a lich knows is yours."