Cheapest priced copy (Doctor Who): $0.49 at Card Kingdom, near mint, their price list as of .
Sisterhood of Karn 
Creature — Cleric · 0/0 · Rare · Doctor Who · #399
This creature enters with a +1/+1 counter on it.
Paradox — Whenever you cast a spell from anywhere other than your hand, double the number of +1/+1 counters on this creature.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
4 printings · $0.49 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Doctor Who | 109 | Rare | $0.49 | $0.49 |
| Doctor Who | 399 | Rare | $0.69 | $0.49 |
| Doctor Who | 714 | Rare | — | $0.79 |
| Doctor Who | 990 | Rare | — | $0.99 |
4 rulings from Wizards of the Coast
- 13 October 2023If a spell or ability allows you to copy a spell on the stack but doesn't specify that the spell is cast, that spell wasn't cast and won't be counted by paradox abilities. However, if a spell or ability allows you to cast a copy of a spell, that spell will be counted for paradox abilities.
- 13 October 2023An instant or sorcery that counts how many spells you've cast from anywhere other than your hand, such as Surge of Brilliance, counts itself if it was cast from a zone other than your hand.
- 13 October 2023A triggered ability that triggers when a spell is cast from anywhere other than your hand, such as that of The Thirteenth Doctor, functions only on the battlefield, so it doesn't trigger when you cast that spell from a zone other than your hand.
- 13 October 2023Paradox abilities count any spells cast from zones other than your hand. These are usually spells cast from exile, the graveyard, or the command zone. They also count spells cast from outside the game, such as spells cast with Wish or Garth One-Eye's ability.