17-Year Cicadas (UNK UW05c)

Sorcery • Mana cost: {7}{W} • Unknown Event • Uncommon

Create ten 1/1 white Insect creature tokens with flying. Exile 17-Year Cicadas with seventeen time counters on it.
Suspend 17 — {0} (Rather than cast this card from your hand, you may pay {0} and exile it with seventeen time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may cast it without paying its mana cost.)
Whenever you cast a spell, if this card is suspended, remove a time counter from it.