At the beginning of your upkeep, surveil 1. Exile a card from your graveyard: Add {C}. Spend this mana only to cast a spell that's one or more colors without {X} in its mana cost.
2020-04-17
If you don't put the card you look at into your graveyard, it remains on top of your library. You'll draw it during your draw step unless something else moves it.
2020-04-17
Mana produced by Titans' Nest can be used to cast a spell that has {X} in an additional or alternative cost.
Printings
Magic Online Promos
(rare)
Ikoria: Lair of Behemoths Promos
—
212p
212s
(rare)