Cheapest priced copy (The Brothers' War Commander): $2.29 at Card Kingdom, near mint, their price list as of .
Wondrous Crucible 
Artifact · Rare · The Brothers' War Commander · #67
Permanents you control have ward {2}.
At the beginning of your end step, mill two cards, then exile a nonland card at random from your graveyard. Copy it. You may cast the copy without paying its mana cost. (A copy of a permanent spell becomes a token.)
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $2.29 to $2.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The Brothers' War Commander | 20 | Rare | $2.49 | — |
| The Brothers' War Commander | 67 | Rare | $2.29 | — |
4 rulings from Wizards of the Coast
- 14 October 2022If you cast a spell “without paying its mana cost,” you can’t pay any alternative costs. You can, however, pay additional costs, such as kicker costs. If the card has any mandatory additional costs, you must pay those.
- 14 October 2022The card remains exiled no matter what happens to the copy.
- 14 October 2022If you don’t cast the copy (perhaps because there are no legal targets available or you don’t want to), the copy will cease to exist.
- 14 October 2022If the copy has {X} in its mana cost, you must choose 0 as the value of X.