Cheapest priced copy (Doctor Who): $1.79 at Card Kingdom, near mint, their price list as of .
Reverse the Polarity 
Instant · Rare · Doctor Who · #54
Choose one —
• Counter all other spells.
• Switch each creature's power and toughness until end of turn.
• Creatures can't be blocked this turn.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
4 printings · $1.79 to $6.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Doctor Who | 54 | Rare | $1.79 | $1.99 |
| Doctor Who | 369 | Rare | $2.99 | $4.99 |
| Doctor Who | 659 | Rare | — | $5.99 |
| Doctor Who | 960 | Rare | — | $6.99 |
2 rulings from Wizards of the Coast
- 13 October 2023Effects that switch a creature's power and toughness apply after all other effects, regardless of when those effects began to apply. For instance, if you switch a 2/4 creature's power and toughness and then give it +2/+0 later in the turn, it's a 4/4 creature, not a 6/2 creature.
- 13 October 2023Because damage remains marked on a creature until the cleanup step or an effect removes that damage, nonlethal damage dealt to a creature may become lethal if you switch its power and toughness during that turn.