Ob Nixilis, Captive Kingpin - [Foil, Showcase] March of the Machine: The Aftermath (MAT) VOW Whenever you cast a creature

Whenever you cast a creature spell with mana value 5 or greater

destroy all nonartifact

you may instead choose land or nonland and reveal cards from the top of your library until you reveal a card of the chosen kind

with a combination of 5 cards of rarity Rare or higher and 2–5 Uncommon

As long as Winter Orb is untapped

Ob Nixilis, Captive Kingpin - [Foil, Showcase] March of the Machine: The Aftermath (MAT) VOW Whenever you cast a creatureFlying, trample Whenever one or more opponents each lose exactly 1 life, put a +1 +1 counter on Ob Nixilis, Captive Kingpin. Exile the top card of your library. Until your next end step, you may play that card.