Niblis of Frost [Eldritch Moon] Zendikar Tawnos finally cracked the puzzle:

Tawnos finally cracked the puzzle: the strange structures did not house Mishra's malevolent creations but were themselves among his creations

It is not my home

−X: Search your library for an artifact card with mana value X or less

the Arisen deals 10 damage to target creature or planeswalker

" —Gerrard Capashen

Niblis of Frost [Eldritch Moon] Zendikar Tawnos finally cracked the puzzle:Set: Eldritch Moon Type: Creature Spirit Rarity: Rare Cost: {2}{U}{U} Flying Prowess (Whenever you cast a noncreature spell, this creature gets +1 +1 until end of turn.) Whenever you cast an instant or sorcery spell, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step.