Chalice of the Void [Masters 25] SPA Predecir Set: Betrayers of Kamigawa Type:

Set: Betrayers of Kamigawa Type: Legendary Creature — Spirit Rare Cost: {4}{R}{R} Goblin offering (You may cast this card any time you could cast an instant by sacrificing a Goblin and paying the difference in mana costs between this and the sacrificed Goblin

centaur druid

Set: Commander 2014 Type: Legendary Creature — Goblin Rare Cost: {2}{R} Haste When Tuktuk the Explorer dies

where X is the sacrificed creature's toughness

"Lord Bolas has shown me how each miserable little life holds untold resources

Chalice of the Void [Masters 25] SPA Predecir Set: Betrayers of Kamigawa Type:Set: Masters 25 Type: Artifact Mythic Cost: {X}{X} Chalice of the Void enters the battlefield with X charge counters on it. Whenever a player casts a spell with converted mana cost equal to the number of charge counters on Chalice of the Void, counter that spell.