Descendants' Path

Enchantment    (CMC:3)

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 that card without paying its mana cost. Otherwise, put that card on the bottom of your library.

173 AVR • ENTerese Nielsen

™ & © 1993—2012 Wizards of the Coast

Legal in: Modern,Extended,Innistrad Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Tribal Wars Standard,Classic,Singleton 100,Commander

Oracle Text (click to copy):

Descendants' Path {2}{G} Enchantment 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 that card without paying its mana cost. Otherwise, put that card on the bottom of your library.

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5/1/2012
If you cast a card "without paying its mana cost," you can't pay any alternative costs. You can pay additional costs, such as kicker costs. If the card has mandatory additional costs, you must pay those.
5/1/2012
If the card has  in its mana cost, you must choose 0 as its value.
5/1/2012
If the revealed card is a creature card that shares a creature type with a creature you control, but you choose not to cast it, it stays on top of your library.

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