Oteclán — Black Lotus Unknown Planechase #PLA018

When you planeswalk to Oteclán and at the beginning of your upkeep, chaos ensues.

Whenever chaos ensues, discover 3. (Exile cards from the top of your library until you exile a nonland card with that mana value or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.)