At the beginning of your upkeep, reveal the top card of your library. If it's a creature card that shares a creature type with a creature you control, you may cast it without paying its mana cost. If you don't cast it, put it on the bottom of your library.
![Descendants' Path [Avacyn Restored]](http://tothetablebgc.myshopify.com/cdn/shop/files/ada93208-5cda-4e2d-b9a7-15345e30b831.png?v=1776619284&width=1445)
