Cheapest priced copy (The List): $0.59 at Card Kingdom, near mint, their price list as of .
Crystalline Crawler 
Artifact Creature — Construct · 1/1 · Rare · The List · #C16-54
Converge — This creature enters with a +1/+1 counter on it for each color of mana spent to cast it.
Remove a +1/+1 counter from this creature: Add one mana of any color.
{T}: Put a +1/+1 counter on this creature.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
5 printings · $0.59 to $1.29 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2016 | 54 | Rare | $0.79 | — |
| Commander Anthology Volume II | 183 | Rare | $1.29Out of stock | — |
| Edge of Eternities Commander | 133 | Rare | $0.69 | — |
| The List | C16-54 | Rare | $0.59 | — |
| The List | CM2-183 | Rare | $0.59 | — |
4 rulings from Wizards of the Coast
- 8 November 2016If 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.
- 8 November 2016The colors of mana are white, blue, black, red, and green. Colorless is not a color.
- 8 November 2016If 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.
- 8 November 2016Unless 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.