Accident-Prone Apprentice // Amphibian Accident is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.
Official card text
Whenever you cast a noncreature spell, Accident-Prone Apprentice perpetually gets +1/+1. This ability also triggers if this card is in exile. Until end of turn, target creature loses all abilities and becomes a blue Frog with base power and toughness 1/1.
Complete guide
Accident-Prone Apprentice is a versatile Otter Wizard from Alchemy that rewards you for casting spells no matter where it is located. Whether it is on the battlefield or waiting in exile after its Adventure, it grows stronger with every noncreature spell you cast. This card combines a scaling threat with a blue utility spell that can neutralize your opponent's most dangerous creatures.
Dual Roles: Wizard and Adventure
Accident-Prone Apprentice can be cast as a creature for 1R or as an Adventure called Amphibian Accident for 1U. The Adventure is a powerful removal tool that turns a creature into a 1/1 Frog. While the Apprentice is on the battlefield or in exile, its triggered ability checks for any noncreature spell you cast. Each time you do, it perpetually gains +1/+1, meaning those stats stay with the card even if it changes zones or returns to your hand.
Perpetual Growth in Exile
A unique feature of this card is that its ability triggers even while it is in the exile zone. If you cast Amphibian Accident first, the card goes to the exile zone as it resolves. While sitting there, every subsequent noncreature spell you cast will make the Apprentice larger. When you finally cast the creature from exile, it will enter the battlefield with all the power and toughness bonuses it accumulated while waiting.
Timing and Targeting
Amphibian Accident is an instant, allowing you to shrink an attacker or blocker at the most inconvenient time for your opponent. Note that the transformation to a 1/1 Frog replaces the creature's base power and toughness. Any +1/+1 counters or equipment already on that creature will still apply to the new 1/1 base, so a creature with three +1/+1 counters will become a 4/4 Frog.
Common Mistakes
Do not forget that 'perpetual' means the bonus is permanent for the rest of the game. If the Apprentice dies and you bring it back from the graveyard, it keeps its buffs. However, the ability only triggers while the card is on the battlefield or in exile. If the card is in your hand, library, or graveyard, casting noncreature spells will not grant it the +1/+1 bonus.
Interaction examples
If your opponent controls Ornithopter of Paradise, you can cast Amphibian Accident targeting it. The Ornithopter loses Flying and its ability to tap for mana, becoming a simple 1/1 blue Frog until the end of the turn. This can disrupt their mana production or remove a crucial blocker.
If you use Professional Face-Breaker to exile Accident-Prone Apprentice from the top of your library, the Apprentice is now in the exile zone. If you then sacrifice another Treasure to exile and cast a noncreature spell, the Apprentice's ability triggers in exile, granting it +1/+1 perpetually before you even cast it.
If an opponent attacks with Professional Face-Breaker, you can cast Amphibian Accident during the declare blockers step. The Face-Breaker loses Menace and its ability to create Treasures, becoming a 1/1 Frog. This allows you to block it easily with any creature you control.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Accident-Prone Apprentice // Amphibian Accident
Original English text — Wizards of the Coast / Scryfall
No additional ruling has been published for this card.
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Meta decks with Accident-Prone Apprentice // Amphibian Accident
No archived Top 8 deck with this card yet.



Ornithopter of Paradise
Professional Face-Breaker