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Berta, Wise Extrapolator

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.
{X}, {T}: Create a 0/0 green and blue Fractal creature token and put X +1/+1 counters on it.

CMC
4
Mana cost
{2}{G}{U}
Color identity
GU
Rarity
rare
Set
Secrets of Strixhaven Promos
Price
—
EDHREC rank
#13639
Buy on TCGplayer
Berta, Wise Extrapolator card art
Berta, Wise Extrapolator turns every creature entering the battlefield into a mana refund, and in the right shell that snowballs fast enough to threaten infinite loops on the spot. Pair her with Intruder Alarm and any creature that produces a token on entry and you have a combo that costs almost nothing to assemble — the engine is that compact. Primo, the Unbounded is the natural home, but anywhere creatures enter repeatedly, Berta earns her slot.

Best Commanders

Commanders with the highest synergy

01
Primo, the Unbounded

Primo, the Unbounded

44.1% of decks · synergy 0.39

Primo, the Unbounded mills creatures into play constantly, and Berta, Wise Extrapolator converts each of those free entries into floating mana — the two cards form the economic backbone of the deck's infinite loops. Nearly half of all Primo lists run Berta for exactly this reason.

02
Clement, the Worrywort

Clement, the Worrywort

34.7% of decks · synergy 0.29

Clement, the Worrywort cares about creatures entering the battlefield, and Berta, Wise Extrapolator makes each of those triggers effectively pay for the next one, dramatically compressing how fast Clement's payoffs chain together. The synergy score and inclusion rate both reflect that Berta is a near-automatic include in Clement builds.

03
Grolnok, the Omnivore

Grolnok, the Omnivore

19.1% of decks · synergy 0.14

Grolnok, the Omnivore mills creatures onto the battlefield for free, and Berta, Wise Extrapolator harvests mana from every creature that lands that way, funding whatever action Grolnok wants to take next. The combination is especially productive because Grolnok's mill is recursive and hard to stop.

04
Helga, Skittish Seer

Helga, Skittish Seer

8.4% of decks · synergy 0.06

Helga, Skittish Seer builds toward explosive turns where multiple creatures enter at once, and Berta, Wise Extrapolator ensures those entries generate enough floating mana to chain even further. The inclusion rate is lower than the top slots, but the role is the same — mana amplification for a creature-dense strategy.

Format Analysis

Where it lives, where it can’t

FormatVerdict
commander legal
legacy legal
modern legal
pioneer legal
standard legal
vintage legal
pauper not legal
oathbreaker legal

Berta, Wise Extrapolator is legal everywhere except Pauper, but competitive constructed formats are unlikely to want her — a four-mana legendary creature that requires other creatures entering the battlefield to generate value is too slow and conditional for Modern or Pioneer. Legacy and Vintage have faster, more reliable mana engines and won't look twice. Commander is the clear home: the format's multiplayer pace, generous card pool, and love of creature-based combo lines put Berta exactly where she wants to be. In Oathbreaker she's technically playable but the 20-life format and smaller deck size narrow the combo windows she needs.

Key Combos

Combo lines featuring this card

Price Context

Current price

unknown tier

Current pricing data for Berta, Wise Extrapolator isn't available in this snapshot, so check Scryfall or TCGPlayer for a live figure. Given her high inclusion rate in Primo, the Unbounded decks and rising combo profile, she's worth picking up before demand from new combo discoveries pushes the price further.

Explore

Sources

Mentioned

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Updated . Data from Scryfall, EDHREC, and Commander Spellbook.