Secret Base

{T}: Add {C}.
{T}: Add one mana of any color. Spend this mana only to cast a spell that shares a watermark with Secret Base.

Squirrel-Powered Scheme

Increase the result of each die you roll by 2.

Steady-Handed Mook

Deathtouch
When Steady-Handed Mook enters, it assembles a Contraption. (Put the top card of your Contraption deck face up onto one of your sprockets.)

Hard Hat Area

Whenever you crank Hard Hat Area, roll two six-sided dice. Hard Hat Area assembles a number of Contraptions equal to the difference between those results. (To assemble a Contraption, put the top card of your Contraption deck face up onto one of your sprockets.)

Monkey-

Whenever a nontoken creature you control dies,
Augment {2}{G} ({2}{G}, Reveal this card from your hand: Combine it with target host. Augment only as a sorcery.)

Snickering Squirrel

You may tap Snickering Squirrel to increase the result of a die any player rolled by 1.

Sundering Fork

Whenever you crank Sundering Fork, destroy target artifact.

Lackey Recycler

Whenever you crank Lackey Recycler, put target creature card from your graveyard on top of your library.

Forest

Gift Horse

Whenever you crank Gift Horse, roll two six-sided dice. Create a number of 1/1 red Goblin creature tokens equal to the difference between those results.

Chittering Doom

Whenever you roll a 4 or higher on a die, create a 1/1 green Squirrel creature token.

Rapid Prototyper

Whenever you crank Rapid Prototyper, create an X/X colorless Construct artifact creature token, where X is the number of artifacts you control.

Big Boa Constrictor

When this creature enters, roll a six-sided die. Target opponent loses life equal to the result.

Refibrillator

Whenever you crank Refibrillator, return target creature card from your graveyard to your hand.

Lobe Lobber

Equipped creature has "{T}: This creature deals 1 damage to target player or planeswalker. Roll a six-sided die. On a 5 or higher, untap it."
Equip {2}

Krark's Other Thumb

If you would roll a die, instead roll two of those dice and ignore one of those results.

Thud-for-Duds

Whenever you crank Thud-for-Duds, roll two six-sided dice. Thud-for-Duds deals damage to target creature equal to the difference between those results.

Hypnotic Swirly Disc

Whenever you crank Hypnotic Swirly Disc, target player mills X cards, where X is the number of creatures you control.

Stamp of Approval

As Stamp of Approval enters, choose a watermark.
Creatures you control with the chosen watermark get +1/+1.

Earl of Squirrel

Squirrellink (Damage dealt by this creature also causes you to create that many 1/1 green Squirrel creature tokens.)
Creature tokens you control are Squirrels in addition to their other creature types.
Other Squirrels you control get +1/+1.

Inhumaniac

At the beginning of your upkeep, roll a six-sided die. On a 3 or 4, put a +1/+1 counter on Inhumaniac. On a 5 or higher, put two +1/+1 counters on it. On a 1, remove all +1/+1 counters from Inhumaniac.

Mad Science Fair Project

{T}: Roll a six-sided die. On a 3 or lower, target player adds {C}. Otherwise, that player adds one mana of any color they choose.

Sword of Dungeons & Dragons

Equipped creature gets +2/+2 and has protection from Rogues and from Clerics.
Whenever equipped creature deals combat damage to a player, create a 4/4 gold Dragon creature token with flying and roll a d20 (a twenty-sided die). If you roll a 20, repeat this process.
Equip {2}

Hydradoodle

As Hydradoodle enters, roll X six-sided dice. Hydradoodle enters with a number of +1/+1 counters on it equal to the total of those results.
Reach, trample

Dispatch Dispensary

Whenever you crank Dispatch Dispensary, create a 2/2 black Rogue creature token with menace.

First Pick

Destroy target artifact or enchantment. Assemble a Contraption. (Put the top card of your Contraption deck face up onto one of your sprockets.)

Twiddlestick Charger

Whenever you crank Twiddlestick Charger, tap or untap target creature.

Swamp

Willing Test Subject

Reach
Whenever you roll a 4 or higher on a die, put a +1/+1 counter on Willing Test Subject.
{6}: Roll a six-sided die.

Steel Squirrel

Whenever you roll a 5 or higher on a die, Steel Squirrel gets +X/+X until end of turn, where X is the result.
{6}: Roll a six-sided die.

Gnomeball Machine

Whenever you crank Gnomeball Machine, create two 1/1 colorless Gnome artifact creature tokens.

Boomflinger

Whenever you crank Boomflinger, roll two six-sided dice. Boomflinger deals damage to target player or planeswalker equal to the difference between those results.