If there are any alternative or additional costs to cast a spell with a converge ability, the mana spent to pay those costs will count. For example, if an effect makes Crystalline Crawler cost {1} more to cast, you could pay {W}{U}{B}{R}{G} to cast it and have it enter the battlefield with five +1/+1 counters.
The colors of mana are white, blue, black, red, and green. Colorless is not a color.
If you cast a spell with converge without spending any mana to cast it (perhaps because an effect allowed you to cast it without paying its mana cost), then the number of colors spent to cast it will be zero.
Last observed on Scryfall 2 months ago at $3.38. Over the trailing 90 days the price moved between $1.25 and $3.41 across 53 observations. Cross-checked across TCGplayer, eBay sold, Cardmarket EU, and Star City.
This printing is one of 2 catalogued treatments from C16 — the lineup includes Nonfoil alongside the standard finish. Across our catalog the Rarix library tracks every variant in the same family so collectors can compare price, scarcity and demand inside a single lineage.
Card #54 of *Commander 2016*, the set that shipped alongside the November 2016 Commander 2016 release.
Card type: Artifact Creature — Construct, printed at rare. Rares occupy the bottom-of-pack rare slot in standard boosters. Mana cost: {4} (4 converted). Keyword abilities: Converge.
Legal in Legacy, Vintage, and Commander.
EDHrec ranks this card #3,128 in Commander, putting it in the niche-pick tier of the format's playable pool.
Illustrated by Jason Felix. Rarix catalogs 558 other cards credited to this artist.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Jason Felix
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
Unless a spell or ability allows you to, you can't choose to pay more mana for a spell with a converge ability just to spend more colors of mana. Likewise, if a spell or ability reduces the amount of mana it costs you to cast a spell with converge, you can't ignore that cost reduction in order to spend more colors of mana.
