Polymorphist's Jest

Polymorphist's Jest card image

Polymorphist's Jest: Instant, Commander 2017. MTG card details, printings, market prices, official rulings, and format legality, all in one place on Mana Grove.

Mana cost
{1}{U}{U}
Mana value
3
Type
Instant
Colour identity
Blue (U)
Rarity
Rare
Set
Commander 2017 (C17)
Released
2017-08-25
Collector number
90
Artist
Craig J Spearing
Commander rank
4,475 (by how often it appears in Commander decks)

Build around this card with Grover

About Polymorphist's Jest

Polymorphist's Jest is a Magic: The Gathering card, a rare blue instant from Commander 2017 (C17), a Commander product released in August 2017. It is collector number 90 in that set, with art by Craig J Spearing. It costs {1}{U}{U} (one generic and two blue mana) to cast, for a mana value of 3. Its colour identity is blue. It is legal in Pioneer, Modern, Legacy, Vintage, Commander, Duel Commander, Oathbreaker and Penny Dreadful. It has been printed in 2 sets, from Magic 2015 (2014) to Commander 2017 (2017). The latest aggregated market price for this printing is $7.13 (normal finish, as of 2026-11-12).

Card text

Until end of turn, each creature target player controls loses all abilities and becomes a blue Frog with base power and toughness 1/1.

"The flies were bothering me." -Jalira, master polymorphist

Market price

Latest aggregated market price for the normal finish of this printing: $7.13 (as of 2026-11-12).

The figure covers this printing only; other printings carry their own price on their own page.

Format legality

Legality of Polymorphist's Jest by format. Formats in which it is not legal are not listed.

PioneerLegal
ModernLegal
LegacyLegal
VintageLegal
CommanderLegal
Duel CommanderLegal
OathbreakerLegal
Penny DreadfulLegal

Other printings of Polymorphist's Jest

Polymorphist's Jest has been printed in 2 sets. The other printings are listed newest first, with the rarity and release year of each.

PrintingRarityYear
Magic 2015 (M15) #75Rare2014

Official rulings

Seven official rulings apply to Polymorphist's Jest, newest first.

  • If one of the affected creatures gains an ability after Polymorphist’s Jest resolves, it will keep that ability.
  • The creatures will lose all other colors and creature types, but they will retain any other card types (such as artifact) or supertypes (such as legendary) they may have.
  • Effects that modify a creature’s power and/or toughness, such as the effect of Titanic Growth, will apply to the creatures no matter when they started to take effect. The same is true for any counters that change their power and/or toughness and effects that switch power and toughness.
  • Creatures that enter the battlefield or come under the target player’s control after Polymorphist’s Jest resolves won’t be affected.
  • If one of the Theros block Gods is affected by Polymorphist’s Jest, it will be a legendary 1/1 blue Frog enchantment creature with no abilities. If it stops being a creature, perhaps because your devotion to its color(s) decreased, it will be a legendary blue enchantment with no abilities. The way continuous effects work, the God’s type-changing ability is applied before the effect that removes that ability is applied.
  • Polymorphist’s Jest doesn’t counter abilities that have already triggered or been activated. In particular, there is no way to cast this spell to stop a creature’s ability that says “At the beginning of your upkeep,” “When this creature enters the battlefield,” or similar from triggering.
  • Polymorphist’s Jest overwrites all previous effects that set the creatures’ base power and toughness to specific values. Any power- or toughness-setting effects that start to apply after Polymorphist’s Jest resolves will overwrite this effect.

Similar cards

Other instant cards with a blue colour identity, ranked by how often they appear in Commander decks.

Explore Mana Grove