Chord of Calling [Magic 2015] Leviathan At the heart of Ish

At the heart of Ish Sah

if Hidden Stag is a creature

Set: Commander Anthology Volume II 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

you win the game

(To fateseal 2

Chord of Calling [Magic 2015] Leviathan At the heart of IshSet: Magic 2015 Type: Instant Rarity: Rare Cost: {X}{G}{G}{G} Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.) Search your library for a creature card with converted mana cost X or less and put it onto the battlefield. Then shuffle your library.