Berta, Wise Extrapolator 
Legendary Creature — Frog Druid1/4
Oracle text (EN)
Legendary Creature — Frog Druid
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.
, 
: Create a 0/0 green and blue Fractal creature token and put X +1/+1 counters on it.
Printing details
- Set
- PSOS · 175p
- Rarity
- Rare
- Language
- EN
- Artist
- Tuan Duong Chu
- Released
- 2026-04-24
- Prices
- €0.09 · $0.50
Price history
The trend shows with at least 7 days of history.
- Cardmarket, trend
The history starts on October 28, 2026 and grows every day.
Show the data
| Date | Cardmarket, trend |
|---|---|
| October 28, 2026 | €0.09 |
Prices
| Source | Non-foil | Foil |
|---|---|---|
| Cardmarket | low €0.02 trend €0.09 30-day avg €0.24 | low €0.09 trend €0.38 30-day avg €0.49 |
| CardTrader (EN) | No offers | |
| CardTrader (any language) | No offers | |
Cardmarket updated Oct 31, 2026
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Legality
- standard Legal
- pioneer Legal
- modern Legal
- legacy Legal
- vintage Legal
- commander Legal
- pauper Not legal
- alchemy Legal
- brawl Legal
- competitivebrawl Legal
- duel Legal
- future Legal
- gladiator Legal
- historic Legal
- oathbreaker Legal
- oldschool Not legal
- paupercommander Not legal
- penny Legal
- predh Not legal
- premodern Not legal
- standardbrawl Legal
- timeless Legal
- tlr Not legal
Rulings
-
Berta's second ability isn't a mana ability. It uses the stack and can be responded to.
-
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.
-
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.
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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.
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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.
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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.