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Rules guide · Legendary Creature

Berta, Wise ExtrapolatorHow it works & interactions with other cards

By the ManaCount desk· 5 min read· Secrets of Strixhaven· April 24, 2026
Carte Magic Berta, Wise Extrapolator

Berta, Wise Extrapolator 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.

01

Official card text

Increment (Whenever you cast a spell, if the amount of mana you spent is greater than this creature's power or toughness, put a +1/+1 counter on this creature.) Whenever one or more +1/+1 counters are put on Berta, add one mana of any color. {X}, {T}: Create a 0/0 green and blue Fractal creature token and put X +1/+1 counters on it.

How it works : Berta, Wise Extrapolator

Original English text — Wizards of the Coast / Scryfall

  1. #1· Wizards of the Coast

    An increment ability will only trigger if the permanent it's on is a creature. Similarly, if the permanent is no longer a creature when its increment ability resolves, the ability won't do anything.

    No other card is named in this ruling.

  2. #2· Wizards of the Coast

    The increment ability resolves before the spell that caused it to trigger. It resolves even if that spell is countered or otherwise leaves the stack.

    No other card is named in this ruling.

  3. #3· Wizards of the Coast

    If increment triggers, the comparison will happen again when the ability tries to resolve. If the amount of mana spent to cast that spell isn't greater than either of that creature's stats anymore, the ability will do nothing.

    No other card is named in this ruling.

  4. #4· Wizards of the Coast

    When comparing the mana spent to the creature's stats as the increment ability resolves, it's possible that the stat that is less than the mana spent changes from power to toughness or vice versa. For example, say you control a 1/3 creature with increment and you pay two mana to cast a spell. Since the amount of mana you spent is greater than the creature's power, increment will trigger. While the increment ability is on the stack, an effect gives the creature with increment +2/-2, making it a 3/1. When the increment ability resolves, the creature will still get a +1/+1 counter since the amount of mana you spent is greater than that creature's toughness.

    No other card is named in this ruling.

  5. #5· Wizards of the Coast

    Whenever you cast a spell, check the amount of mana you spent to cast it against the power and toughness of the creature with increment. If the amount of mana you spent isn't greater than either of that creature's stats, increment won't trigger at all.

    No other card is named in this ruling.

  6. #6· Wizards of the Coast

    Berta's second ability isn't a mana ability. It uses the stack and can be responded to.

    No other card is named in this ruling.

02

Popular combos

Real combos played by the community, sorted by popularity.

Berta, Wise Extrapolator
+Intruder Alarm
#1

Berta, Wise Extrapolator + Intruder Alarm

Infinite creature ETBInfinite creature LTBInfinite creature tokensInfinite death triggers
  1. 1Activate Berta by paying {0} and tapping it, creating a 0/0 Fractal creature token.
  2. 2The Fractal enters and dies as a state-based action due to having 0 toughness.
  3. 3Intruder Alarm triggers, untapping all creatures.
  4. 4Repeat.
Berta, Wise Extrapolator
+Intruder Alarm
+Ivy Lane Denizen
#2

Berta, Wise Extrapolator + Intruder Alarm + Ivy Lane Denizen

Infinite creature LTBInfinite death triggersInfinite +1/+1 counters on a creatureInfinite creature ETB
  1. 1Activate Berta by paying {1} and tapping it, creating a 0/0 Fractal creature token and putting a +1/+1 counter on it.
  2. 2When the Fractal enters, Intruder Alarm and Ivy Lane Denizen trigger.
  3. 3Resolve the Intruder Alarm trigger, untapping all creatures.
  4. 4Resolve the Ivy Lane Denizen trigger, putting a +1/+1 counter on Berta.
  5. 5Berta triggers, adding {1}.
  6. 6Repeat.
Berta, Wise Extrapolator
+Shrieking Drake
+Three Tree Scribe
#3

Berta, Wise Extrapolator + Shrieking Drake + Three Tree Scribe

Infinite +1/+1 counters on a creatureInfinite creature ETBInfinite creature LTBInfinite storm count
  1. 1Cast Shrieking Drake by paying {U}.
  2. 2When Shrieking Drake enters, it triggers, returning itself from the battlefield to your hand.
  3. 3Three Tree Scribe triggers, putting a +1/+1 counter on Berta.
  4. 4Berta triggers, adding {U}.
  5. 5Repeat.
Ms. Bumbleflower
+Shrieking Drake
+Berta, Wise Extrapolator
#4

Ms. Bumbleflower + Shrieking Drake + Berta, Wise Extrapolator

Infinite card draw for opponentsInfinite draw triggers for each opponentNear-infinite +1/+1 counters on a creatureNear-infinite creature ETB
  1. 1Cast Shrieking Drake by paying {U}.
  2. 2Ms. Bumbleflower triggers, causing an opponent to draw a card and putting a +1/+1 counter on Berta.
  3. 3Berta triggers, adding {U}.
  4. 4When Shrieking Drake enters, it triggers, returning it from the battlefield to your hand.
  5. 5Repeat.
Berta, Wise Extrapolator
+Intruder Alarm
+Xavier Sal, Infested Captain
#5

Berta, Wise Extrapolator + Intruder Alarm + Xavier Sal, Infested Captain

Infinite creature ETBInfinite creature LTBInfinite death triggersInfinite mana creatures you control can produce
  1. 1Activate Berta by paying {1} and tapping it, creating a 0/0 Fractal creature token and putting a +1/+1 counter on it.
  2. 2When the Fractal enters, Intruder Alarm triggers, untapping all creatures.
  3. 3Activate Xavier Sal's second ability by tapping it and sacrificing the Fractal, causing you to proliferate and put a +1/+1 counter on Berta.
  4. 4Berta triggers, adding {1}.
  5. 5Repeat.
Berta, Wise Extrapolator
+Animation Module
+Extruder
#6

Berta, Wise Extrapolator + Animation Module + Extruder

Infinite artifact ETBInfinite artifact LTBInfinite artifact sacrifice triggersInfinite +1/+1 counters on a creature
  1. 1Activate Extruder by sacrificing another artifact, putting a +1/+1 counter on Berta.
  2. 2Berta and Animation Module trigger.
  3. 3Resolve the Berta trigger, adding {1}.
  4. 4Resolve the Animation Module trigger, causing you to pay {1} to create a 1/1 Servo artifact creature token.
  5. 5Repeat.
Animation Module
+Decoction Module
+Fabrication Module
+Berta, Wise Extrapolator
#7

Animation Module + Decoction Module + Fabrication Module + Berta, Wise Extrapolator

Infinite artifact ETBInfinite +1/+1 counters on a creatureInfinite creature ETBInfinite creature tokens
  1. 1Cause a creature to enter the battlefield.
  2. 2Decoction Module triggers, causing you to get {E}.
  3. 3Fabrication Module triggers, putting a +1/+1 counter on Berta.
  4. 4Berta and Animation Module trigger.
  5. 5Resolve the Berta trigger, adding {1}.
  6. 6Resolve the Animation Module trigger, causing you to pay {1} to create a 1/1 Servo artifact creature token.
  7. 7When the Servo enters, Decoction Module triggers, causing you to get {E}.
  8. 8Repeat from step 3.
Donatello, the Brains
+Animation Module
+Mutagen Man, Living Ooze
+Berta, Wise Extrapolator
#8

Donatello, the Brains + Animation Module + Mutagen Man, Living Ooze + Berta, Wise Extrapolator

Infinite artifact ETBInfinite artifact LTBInfinite artifact sacrifice triggersInfinite creature ETB
  1. 1Activate a Mutagen by paying {0} due to Mutagen Man, tapping and sacrificing it, putting a +1/+1 counter on Berta.
  2. 2Berta and Animation Module trigger.
  3. 3Resolve the Berta trigger, adding {1}.
  4. 4Resolve the Animation Module trigger, causing you to pay {1} to create a 1/1 Servo artifact creature token and a Mutagen token.
  5. 5Repeat.

Related cards and tokens

03

Legal formats

standardfuturehistorictimelessgladiatorpioneermodernlegacyvintagepennycommanderoathbreakerstandardbrawlbrawlcompetitivebrawlalchemyduel
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Official source