Cheapest priced copy (Throne of Eldraine): $0.35 at Card Kingdom, near mint, their price list as of .
Claim the Firstborn 
Sorcery · Uncommon · Throne of Eldraine · #118
Gain control of target creature with mana value 3 or less until end of turn. Untap that creature. It gains haste until end of turn.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
4 printings · $0.35 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Throne of Eldraine | 118 | Uncommon | $0.35 | $0.79 |
| Secret Lair Drop (The Kidnapping of Toby) | 2837 | Rare | — | — |
| Strixhaven Mystical Archive | 37 | Uncommon | $0.35 | $0.79 |
| Strixhaven Mystical Archive | 100 | Uncommon | $0.59Out of stock | $0.49 |
3 rulings from Wizards of the Coast
- 4 October 2019Gaining control of a creature doesn't cause you to gain control of any Auras or Equipment attached to it.
- 4 October 2019Claim the Firstborn can target any creature with mana value 3 or less, even one that's untapped or one you already control.
- 4 October 2019If a creature on the battlefield has {X} in its mana cost, X is considered to be 0.