Cheapest priced copy (Tales of Middle-earth Commander): $0.79 at Card Kingdom, near mint, their price list as of .
Genesis Wave 
Sorcery · Rare · Scars of Mirrodin · #122
Reveal the top X cards of your library. You may put any number of permanent cards with mana value X or less from among them onto the battlefield. Then put all cards revealed this way that weren't put onto the battlefield into your graveyard.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
9 printings · $0.79 to $44.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Foundations | 221 | Rare | $0.99 | $0.79 |
| Foundations | 334 | Rare | $3.99 | $8.99 |
| Foundations | 396 | Rare | — | $44.99 |
| Iconic Masters | 164 | Rare | $0.99 | $1.99 |
| Tales of Middle-earth Commander | 245 | Rare | $0.79 | — |
| Foundations Promos | 221s | Rare | — | $2.79 |
| Secret Lair Countdown | 75 | Rare | — | — |
| Secret Lair Drop | 2752 | Rare | — | — |
| Scars of Mirrodin | 122 | Rare | $0.99 | $4.99 |
6 rulings from Wizards of the Coast
- 8 November 2024You don't have to put permanent cards revealed this way onto the battlefield if you choose not to, regardless of their mana values.
- 8 November 2024If you have fewer than X cards in your library, you reveal all of them.
- 8 November 2024If a permanent card in your library has no mana symbols in its upper right corner (because it's a land card, for example), its mana value is 0. Such cards can always be put onto the battlefield with Genesis Wave.
- 8 November 2024If a card in a player's library has {X} in its mana cost, X is considered to be 0.
- 8 November 2024A permanent card is an artifact, battle, creature, enchantment, land, or planeswalker card.
- 8 November 2024All of the permanents put onto the battlefield this way enter at the same time. If any have triggered abilities that trigger on something else entering, they'll see each other.