Bolas's Citadel (Promo Pack) [War of the Spark Promos] XY148 Criosphinx Sovereign or another Sphinx

Criosphinx Sovereign or another Sphinx enters the battlefield under your control

look at the top six cards of your library

Set: Sun & Moon: Burning Shadows Type: Darkness Rarity: Ultra Rare Retreat cost: Colorless

Set: Alliances Type: Instant Rarity: Uncommon Cost: {3}{U}{U} You may pay 1 life and exile a blue card from your hand rather than pay this spell's mana cost

and your friends may cast them with your permission

Bolas's Citadel (Promo Pack) [War of the Spark Promos] XY148 Criosphinx Sovereign or another SphinxSet: War of the Spark Promos Type: Legendary Artifact Rarity: Rare Cost: {3}{B}{B}{B} You may look at the top card of your library any time. You may play lands and cast spells from the top of your library. If you cast a spell this way, pay life equal to its mana value rather than pay its mana cost. {T}, Sacrifice ten nonland permanents: Each opponent loses 10 life.