Trinisphere [Darksteel] Kithkin Knight Xantcha attacks each combat if

Xantcha attacks each combat if able and can't attack its owner or planeswalkers its owner controls

Set: Hour of Devastation Prerelease Promos Type: Creature — Horse Rarity: Mythic Cost: {3}{W}{W} Other Horses you control have indestructible

Even bigger

You may put that card on the bottom of your library

Set: Eldritch Moon Prerelease Promos Type: Enchantment — Aura Rarity: Rare Cost: {2}{U} Enchant creature

Trinisphere [Darksteel] Kithkin Knight Xantcha attacks each combat ifSet: Darksteel Type: Artifact Rarity: Rare Cost: {3} As long as Trinisphere is untapped, each spell that would cost less than three mana to cast costs three mana to cast. (Additional mana in the cost may be paid with any color of mana or colorless mana. For example, a spell that would cost {1}{B} to cast costs {2}{B} to cast instead.)