Jace's Echoes

Echo {2}{u}{u} (At the beginning of your upkeep,
if Jace's Echoes came under your control since
the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)
When you pay Jace's Echoes' echo cost,
create a token copy of it. (You may pay the
echo cost for it during your next upkeep.)