Cheapest priced copy (Commander 2013 Oversized): $0.99 at Card Kingdom, foil, near mint, their price list as of .
Marath, Will of the Wild 
Legendary Creature — Elemental Beast · 0/0 · Mythic · Commander 2013 · #198
Marath enters with a number of +1/+1 counters on it equal to the amount of mana spent to cast it.
{X}, Remove X +1/+1 counters from Marath: Choose one —
• Put X +1/+1 counters on target creature. X can't be 0.
• Marath deals X damage to any target. X can't be 0.
• Create an X/X green Elemental creature token. X can't be 0.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
3 printings · $0.99 to $1.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2013 | 198 | Mythic | $1.79Out of stock | — |
| Commander Legends | 527 | Mythic | — | — |
| Commander 2013 Oversized | 198 | Mythic | — | $0.99 |
7 rulings from Wizards of the Coast
- 1 February 2014The amount of mana you spent to cast this creature is usually equal to its mana value. However, you also include any additional costs you pay, including the cost imposed for casting your commander from the command zone.
- 1 February 2014If Marath enters the battlefield without being cast, then no mana was spent to cast it. It will therefore enter the battlefield without any +1/+1 counters. If no other effects are increasing its toughness at that time, it will subsequently be put into its owner's graveyard as a state-based action.
- 1 February 2014You can't choose to pay extra mana to cast a creature spell unless something instructs you to.
- 10 November 2020You can't choose to pay extra mana to cast a creature spell unless something instructs you to.
- 10 November 2020You announce the value of X as you activate the ability, and all instances of X in the activation cost are equal to the announced value. For example, if you choose 2 as the value of X, then you pay 2 and remove two +1/+1 counters to pay the cost.
- 10 November 2020If Marath enters the battlefield without being cast, then no mana was spent to cast it. It will therefore enter the battlefield without any +1/+1 counters. If no other effects are increasing its toughness at that time, it will subsequently be put into its owner's graveyard as a state-based action.
- 10 November 2020The amount of mana you spent to cast this creature is usually equal to its mana value. However, you also include any additional costs you pay, including the cost imposed for casting your commander from the command zone.