Cheapest priced copy (Modern Horizons 3 Commander): $0.49 at Card Kingdom, near mint, their price list as of .
March from Velis Vel 
Sorcery · Rare · Modern Horizons 3 Commander · #48
Choose a nonbasic land type. Each land you control of that type becomes a copy of target creature you control until end of turn and gains haste until end of turn.
Flashback {4}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Modern Horizons 3 Commander | 48 | Rare | $0.49 | $0.49 |
| Modern Horizons 3 Commander | 100 | Rare | $0.49 | — |
10 rulings from Wizards of the Coast
- 7 June 2024You must still follow any timing restrictions and permissions, including those based on the card's type. For instance, you can cast a sorcery using flashback only when you could normally cast a sorcery.
- 7 June 2024To determine the total cost of a spell, start with the mana cost or alternative cost (such as a flashback cost) you're paying, add any cost increases, then apply any cost reductions. The mana value of the spell is determined only by its mana cost, no matter what the total cost to cast the spell was.
- 7 June 2024A spell cast using flashback will always be exiled afterward, whether it resolves, is countered, or leaves the stack in some other way.
- 7 June 2024"Flashback [cost]" means "You may cast this card from your graveyard by paying [cost] rather than paying its mana cost" and "If the flashback cost was paid, exile this card instead of putting it anywhere else any time it would leave the stack."
- 7 June 2024If a card with flashback is put into your graveyard during your turn, you can cast it if it's legal to do so before any other player can take any actions.
- 7 June 2024Because the lands aren't entering the battlefield when they become copies of the creature, any "When [this creature] enters the battlefield" or "[This creature] enters the battlefield with" abilities of the copied creature won't apply.
- 7 June 2024If the copied creature is copying something else, then the lands become copies of whatever that creature copied.
- 7 June 2024If the copied creature has {X} in its mana cost, X is 0.
- 7 June 2024You can cast a spell using flashback even if it was somehow put into your graveyard without having been cast.
- 7 June 2024The lands copy exactly what was printed on the original creature and nothing else (unless that permanent is copying something else; see below). They don't copy whether that creature is tapped or untapped, whether it has any counters on it or Auras and Equipment attached to it, and so on.