Titans' Nest
From Ikoria: Lair of Behemoths set
Titans' Nest
Enchantment
At the beginning of your upkeep, surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)
Exile a card from your graveyard: Add
. Spend this mana only to cast a spell that's one or more colors without
in its mana cost.