3 cards with Increment (and a few more)

forge-gui/res/cardsfolder/upcoming/berta_wise_extrapolator.txt

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+Name:Berta, Wise Extrapolator
+ManaCost:2 G U
+Types:Legendary Creature Frog Druid
+PT:1/4
+K:Increment
+T:Mode$ CounterAddedOnce | ValidCard$ Card.Self | TriggerZones$ Battlefield | OptionalDecider$ You | CounterType$ P1P1 | Execute$ TrigMana | TriggerDescription$ Whenever one or more +1/+1 counters are put on NICKNAME, add one mana of any color.
+SVar:TrigMana:DB$ Mana | Produced$ Any
+A:AB$ Token | Cost$ X T | TokenScript$ gu_0_0_fractal | RememberTokens$ True | SubAbility$ DBPutCounter | SpellDescription$ Create a 0/0 green and blue Fractal creature token and put X +1/+1 counters on it.
+SVar:DBPutCounter:DB$ PutCounter | Defined$ Remembered | CounterType$ P1P1 | CounterNum$ X | SubAbility$ DBCleanup
+SVar:DBCleanup:DB$ Cleanup | ClearRemembered$ True
+SVar:X:Count$xPaid
+DeckHas:Ability$Counters|Token
+Oracle: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.)\nWhenever one or more +1/+1 counters are put on Berta, add one mana of any color.\n{X}, {T}: Create a 0/0 green and blue Fractal creature token and put X +1/+1 counters on it.

forge-gui/res/cardsfolder/upcoming/cuboid_colony.txt

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+Name:Cuboid Colony
+ManaCost:G U
+Types:Creature Insect
+PT:1/1
+K:Flash
+K:Flying
+K:Trample
+K:Increment
+Oracle:Flash\nFlying, trample\nIncrement (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.)

forge-gui/res/cardsfolder/upcoming/garrison_excavator.txt

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+Name:Garrison Excavator
+ManaCost:3 R
+Types:Creature Orc Sorcerer
+PT:3/4
+K:Menace
+T:Mode$ ChangesZoneAll | ValidCards$ Card.YouOwn | Origin$ Graveyard | Destination$ Any | TriggerZones$ Battlefield | Execute$ TrigToken | TriggerDescription$ Whenever one or more cards leave your graveyard, create a 2/2 red and white Spirit creature token.
+SVar:TrigToken:DB$ Token | TokenScript$ rw_2_2_spirit | TokenOwner$ You
+DeckHas:Ability$Graveyard
+Oracle:Menace (This creature can't be blocked except by two or more creatures.)\nWhenever one or more cards leave your graveyard, create a 2/2 red and white Spirit creature token.

forge-gui/res/cardsfolder/upcoming/group_project.txt

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+Name:Group Project
+ManaCost:1 W
+Types:Sorcery
+A:SP$ Token | TokenScript$ rw_2_2_spirit | TokenOwner$ You | SpellDescription$ Create a 2/2 red and white Spirit creature token.
+K:Flashback:tapXType<3/Creature>
+DeckHas:Ability$Token
+Oracle:Create a 2/2 red and white Spirit creature token.\nFlashback—Tap three untapped creatures you control. (You may cast this card from your graveyard for its flashback cost. Then exile it.)

forge-gui/res/cardsfolder/upcoming/pensive_professor.txt

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+Name:Pensive Professor
+ManaCost:1 U U
+Types:Creature Human Wizard
+PT:0/2
+K:Increment
+T:Mode$ CounterAddedOnce | ValidCard$ Card.Self | TriggerZones$ Battlefield | CounterType$ P1P1 | Execute$ TrigDraw | TriggerDescription$ Whenever one or more +1/+1 counters are put on this creature, draw a card.
+SVar:TrigDraw:DB$ Draw
+DeckHas:Ability$Counters
+Oracle: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.)\nWhenever one or more +1/+1 counters are put on this creature, draw a card.

forge-gui/res/tokenscripts/rw_2_2_spirit.txt

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+Name:Spirit Token
+ManaCost:no cost
+Colors:red,white
+Types:Creature Spirit
+PT:2/2
+Oracle: