Mosswort Bridge interaction with Eldrazi Titans
Hi,
If an effect instructs you to play a card, you play it if it's a land, or cast it if it's not. With something like Ulamog, the Ceaseless Hunger, you're casting the card (since Ulamog is not a land), so you'll get the cast trigger from Ulamog.
701.11b To play a card means to play that card as a land or to cast that card as a spell, whichever is appropriate.
Nathan Long