Crystalline Crawler [Commander 2016] Darkness[-20] When you sacrifice Foul Emissary

When you sacrifice Foul Emissary while casting a spell with emerge

and an appetite

Set: Streets of New Capenna Commander Type: Creature — Cephalid Rogue Rarity: Rare Cost: {2}{U} Cephalid Facetaker can't be blocked

Set: Summer Magic / Edgar Type: Instant Rarity: Common Cost: {W} Choose one —

you get {E}{E}{E}{E} (four energy counters)

Crystalline Crawler [Commander 2016] Darkness[-20] When you sacrifice Foul EmissarySet: Commander 2016 Type: Artifact Creature Construct Rarity: Rare Cost: {4} Converge Crystalline Crawler enters the battlefield with a +1 +1 counter on it for each color of mana spent to cast it. Remove a +1 +1 counter from Crystalline Crawler: Add one mana of any color. {T}: Put a +1 +1 counter on Crystalline Crawler.