Cheapest priced copy (Commander 2020): $0.49 at Card Kingdom, near mint, their price list as of .
Painful Truths 
Sorcery · Rare · Battle for Zendikar · #120
Converge — You draw X cards and lose X life, where X is the number of colors of mana spent to cast this spell.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
13 printings · $0.49 to $11.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Battle for Zendikar | 120 | Rare | $0.69 | $1.49 |
| Commander 2017 | 118 | Rare | $0.59 | — |
| Commander 2020 | 134 | Rare | $0.49 | — |
| Dominaria United Commander | 116 | Rare | $0.49 | — |
| Lorwyn Eclipsed Commander | 82 | Rare | $0.49 | — |
| March of the Machine Commander | 262 | Rare | $0.49 | — |
| New Capenna Commander | 255 | Rare | $0.49 | — |
| Phyrexia: All Will Be One Commander | 95 | Rare | $0.49 | — |
| Outlaws of Thunder Junction Commander | 146 | Rare | $0.49 | — |
| Battle for Zendikar Promos | 120p | Rare | $0.59 | $11.99Out of stock |
| Battle for Zendikar Promos | 120s | Rare | — | $2.99 |
| Secret Lair Drop | 2302 | Rare | $3.49 | $3.99 |
| Star Trek Commander | 447 | Rare | — | — |
5 rulings from Wizards of the Coast
- 25 August 2015If a spell with a converge ability is copied, no mana was spent to cast the copy, so the number of colors of mana spent to cast the spell will be zero. The number of colors spent to cast the original spell is not copied.
- 25 August 2015The maximum number of colors of mana you can spend to cast a spell is five. Colorless is not a color. Note that the cost of a spell with converge may limit how many colors of mana you can spend.
- 25 August 2015If 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 sorcery spells cost {1} more to cast, you could pay {W}{U}{B}{R} to cast Radiant Flames and deal 4 damage to each creature.
- 25 August 2015Unless 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.
- 25 August 2015If 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.