Cheapest priced copy (Doctor Who): $0.49 at Card Kingdom, near mint, their price list as of .
Jenny Flint 
Legendary Creature — Human Detective · 2/2 · Rare · Doctor Who · #420
Partner with Madame Vastra
First strike
Training (Whenever this creature attacks with another creature with greater power, put a +1/+1 counter on this creature.)
Whenever you sacrifice a Clue or Food, put a +1/+1 counter on another target creature you control.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
4 printings · $0.49 to $3.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Doctor Who | 136 | Rare | $0.49 | $0.49 |
| Doctor Who | 420 | Rare | $0.69 | $1.49 |
| Doctor Who | 741 | Rare | — | $1.99 |
| Doctor Who | 1011 | Rare | — | $3.49 |
5 rulings from Wizards of the Coast
- 13 October 2023The second ability represented by the "partner with [name]" keyword modifies the rules for deck construction in the Commander variant and has no function outside of that variant. If a legendary creature card with "partner with [name]" is designated as your commander, the named legendary creature card can also be designated as your commander.
- 13 October 2023Once a creature's training ability has triggered, destroying the other attacking creature or reducing its power won't stop the creature with training from getting a +1/+1 counter.
- 13 October 2023"Partner with [name]" represents two abilities. The first is a triggered ability: "When this permanent enters the battlefield, target player may search their library for a card named [name], reveal it, put it into their hand, then shuffle."
- 13 October 2023A creature's training ability triggers only when both that creature and a creature with greater power are declared as attackers. Increasing a creature's power after attackers are declared won't cause a training ability to trigger.
- 13 October 2023Note that the target player searches their library (which may be affected by effects such as that of Stranglehold) and that the card they find is revealed, even though these words aren't included in the ability's reminder text.