Kemena, Seeker of the Gate

{r}{g},{t}: Create a colorless land token named
Ancient Seal Tower with ~{t}: Add {c}.~
Activate this ability only once on your turn.
{4},{t}, Sacrifice Kemena and four Ancient Seal
Towers: create a colorless legendary land token
named The Severed Expanse with ~When this
land enters play, choose a creature type. At the
beginning of your upkeep, you may search your
library for a creature card of the chosen type and
put it into play, then shuffle.~