Glory of Ten-Towns

Convoke (Your creatures can help cast this spell.
Each creature you tap while casting this spell pays for
1 or one mana of that creature's color.)
At the start of your end step, you may search
your library for a land and put it on the
battlefield.
On your upkeep, if you control ten Town lands,
at least ten Townsfolk, and a card called Council
of the Ten, you win the game.