Engineered Explosives [Ultimate Masters] Elemental Horse "Resignedly beneath the sky/The melancholy

"Resignedly beneath the sky/The melancholy waters lie

they gain control of Emberwilde Djinn

For each of those creatures

When Avalanche Riders enters the battlefield

Whenever Cockatrice blocks or becomes blocked by a non-Wall creature

Engineered Explosives [Ultimate Masters] Elemental Horse "Resignedly beneath the sky/The melancholySet: Ultimate Masters Type: Artifact Rarity: Rare Cost: {X} Sunburst (This enters the battlefield with a charge counter on it for each color of mana spent to cast it.) {2}, Sacrifice Engineered Explosives: Destroy each nonland permanent with mana value equal to the number of charge counters on Engineered Explosives.