Cheapest priced copy (Double Masters): $0.49 at Card Kingdom, near mint, their price list as of .
Magus of the Will 
Creature — Human Wizard · 3/3 · Rare · Double Masters · #98
{2}{B}, {T}, Exile this creature: Until end of turn, you may play lands and cast spells from your graveyard. If a card would be put into your graveyard from anywhere this turn, exile that card instead.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.49 to $1.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Double Masters | 98 | Rare | $0.49 | $1.99 |
| Commander 2016 | 14 | Rare | $0.69 | — |
6 rulings from Wizards of the Coast
- 7 August 2020Magus of the Will doesn't change when you can play the cards in your graveyard. For example, if you have a creature card without flash in your graveyard, you can cast it only during your main phase while the stack is empty.
- 7 August 2020You pay the costs for a card in your graveyard if you cast it. You may pay alternative costs such as overload rather than the card's mana cost.
- 7 August 2020You may play a land card from your graveyard only if you have an available land play.
- 7 August 2020Cards that would be put into your graveyard are exiled even if you didn't play them this turn, such as a nontoken creature that would die.
- 7 August 2020Tokens are put into your graveyard as normal (and cease to exist soon after). Abilities that trigger when a creature dies can trigger on token creatures being put into your graveyard but won't trigger on nontoken creatures being exiled instead of being put into your graveyard.
- 7 August 2020If another effect tries to change where a spell is put as it resolves, such as that of a rebound or buyback ability, you may choose whether to exile the card to Magus of the Will's effect or to apply the other effect.