Spires of Eternity

Level up {c} or {2} ({c} or {2}: Put a level counter on
this land. Level up only as a sorcery.)
[Level 0-5] {t}: Add {c}.
[Level 5-10] {t}: Add {c}{c}.
[Level 10-15] {t}: Add {c}{c}{c}.
[Level 15+] {t}: Add {c}{c}{c}{c}.