Polymorphist's Jest
Instant
Until end of turn, each creature target player controls loses all abilities and becomes a blue Frog with base power and toughness 1/1.
- CMC
- 3
- Mana cost
- Color identity
- U
- Rarity
- rare
- Set
- Commander 2017
- Price
- $7.12
- EDHREC rank
- #4304
Polymorphist's Jest turns every creature an opponent controls into a 1/1 Frog with no abilities until end of turn — at instant speed, for three mana, affecting an entire board. It's a combat blowout, a combo enabler, and a political weapon rolled into one, and Toxrill, the Corrosive decks run it in over half their lists for good reason.
Best Commanders
Commanders with the highest synergy
Toxrill, the Corrosive
Toxrill, the Corrosive places a slime counter on every non-Slug creature at each end step, and Polymorphist's Jest strips all abilities before that trigger resolves — meaning creatures that would otherwise be immune or have hexproof get slugged just the same, while the 1/1 bodies are trivial to kill or block.
Clement, the Worrywort
Clement, the Worrywort cares about casting spells on your opponents' turns, and Polymorphist's Jest is exactly the kind of instant you flash in during combat to wreck an alpha strike while simultaneously triggering Clement, the Worrywort's advantage engine.
Grolnok, the Omnivore
Grolnok, the Omnivore mills cards whenever a Frog deals combat damage, so Polymorphist's Jest converting an opponent's entire board into Frogs mid-combat turns their creatures into fuel for Grolnok, the Omnivore's mill trigger if any sneak through.
Sephiroth, Planet's Heir
Sephiroth, Planet's Heir punishes opponents for having creatures with abilities, and Polymorphist's Jest blanking a board of threats for a turn creates the kind of tempo window Sephiroth, Planet's Heir needs to press damage or resolve a critical ability safely.
Tatsunari, Toad Rider
Tatsunari, Toad Rider creates a Frog token whenever you cast an enchantment, but Polymorphist's Jest still slots in as a combat trick that protects the team by neutralizing blockers — the Frog tribal subtype is a minor upside, but the instant-speed board nerf is the real draw.
Format Analysis
Where it lives, where it can’t
| Format | Verdict |
|---|---|
| commander | legal |
| legacy | legal |
| modern | legal |
| pioneer | legal |
| standard | not legal |
| vintage | legal |
| pauper | not legal |
| oathbreaker | legal |
Polymorphist's Jest is legal in Commander, Legacy, Modern, Pioneer, Vintage, and Oathbreaker, but its home is Commander by a wide margin. In one-on-one formats the three-mana instant that only lasts until end of turn rarely competes with removal that permanently answers a threat, and in Legacy or Vintage the card is simply too slow and too narrow for those formats' threat density. Commander is where it thrives: multiplayer boards are wide, creatures carry game-winning abilities, and flashing this in during a combat step can invalidate a table's worth of work. In Oathbreaker it can pull similar duty given the faster, smaller-board gameplay, but the card's ceiling is firmly in Commander.
Key Combos
Combo lines featuring this card
Budget Alternatives
Cheaper options that do most of the same work
Sudden Spoiling does almost the same job — instant speed, strips abilities, reduces power and toughness — and can be found for under a dollar, though it only hits one opponent's creatures rather than a targeted subset and can't be responded to due to split second. If the goal is purely combat disruption rather than the Frog synergy payoff, Sudden Spoiling is the cleaner budget swap; the only thing you give up compared to Polymorphist's Jest is the creature type change and the ability to target a specific player's board rather than all opponents.
Price Context
Current price
$7.12 mid tier
At $7.12, Polymorphist's Jest sits in the mid tier — expensive enough to feel like a deliberate include, cheap enough that it earns its slot in the decks that actually want it. It holds value well given its unique effect and consistent demand from Toxrill and Frog-tribal lists, so the price is fair for what it does.
Explore
Sources
Mentioned
- Toxrill, the Corrosive
- Clement, the Worrywort
- Grolnok, the Omnivore
- Sephiroth, Planet's Heir
- Tatsunari, Toad Rider
Updated . Data from Scryfall, EDHREC, and Commander Spellbook.