Design:
1. Win more cards
2. Too many dead draws
3. No strong win-con
4. No plan B
5. Idea from Zettelgast: once a deck has been built, maximize synergy by comparing one card to many (one by one)

1) Mana sources:

"Any mana source that can unconditionally, at any point of game after
resolving, generate one or more mana for one card at no mana cost is an automatic
inclusion."

1 Lotus Petal
1 Elvish Spirit Guide
1 Simian Spirit Guide
1 Chancellor of the Tangle
1 Lion’s Eye Diamond
1 Geosurge
1 Mox Opal
1 Chrome Mox
1 Gemstone Cavern
1 Culling the Weak
1 Infernal Plunge
1 Dark Ritual
1 Tinder Wall
1 Rite of Flame
1 Cabal Ritual
1 Pyretic Ritual
1 Desperate Ritual
1 Grim Monolith
1 Channel the Suns
1 Land Grant
1 Chancellor of the Tangle
1 Summoner’s Pact (into spirit guide)
1 Seething Song
1 Chromatic Sphere
1 Chromatic Star
1 Barbed Sextant
1 Wild Cantor
1 Blood Pet
1 Skirk Prospector
1 Su-Chi
1 Cathodion
1 Blisterpod
1 Caravan Vigil
1 Overeager Apprentice
1 Channel
1 Battle Hymn
1 Natural Balance

For thinning effects, e.g. to abuse Charbelcher, also see: https://www.mtggoldfish.com/deck/2863197#paper
+1 mana after 1 turn:
1 Utopia Sprawl
1 Wild Growth
1 Basal Sliver
1 Blood Vassal
1 Grinning Ignus
1 Astrolabe
1 Call the Scions
1 Coal Stoker
1 Eladamri's Vineyard
1 Magus of the Vineyard
1 Gaea's Touch
1 Worn Powerstone
1 Krark Clan Ironworks (with artifacts nets mana)
1 Myr Moonvessel
1 Priest of Gix
1 Priest of Urabrask
1 Pentad Prism
1 Satyr Hedonist
1 Thran Dynamo

Mana after several turns, conditionally:
1 Bubbling Muck
1 Songs of the Damned
1 Lotus Bloom

2) Tutor:
1 Demonic Tutor
1 Vampiric Tutor
1 Imperial Seal
1 Entomb
1 Demonic Consultation
1 Gamble
1 Enlightened Tutor
1 Worldy Tutor
1 Sylvan Tutor
1 Traverse the Ulvenwald
1 Mystical Tutor
1 Personal Tutor
1 Scheming Symmetry
1 Diabolic Intent
1 Tinker
1 Spoils of the Vault
1 Tainted Pact
1 Lim-Dul's Vault
1 Sylvan Scrying
1 Into the North
1 Intuition
1 Buried from Alive
1 Muddle the Mixture
1 Grim Tutor
1 Praetor's Grasp
1 Expedition Map
1 Jarad's Orders
1 Bring to Light
1 Summoner's Pact

3) Draw:
1 Street Wraith
1 Gitaxian Probe
1 Manamorphose
1 Edge of Autumn
1 Wheel of Fortune
1 Reforge the Soul
1 Timetwister
1 Windfall
1 Day's Undoing
1 Necropotence
1 Slithermuse
1 Diminishing Returns
1 Memory Jar
1 Time Spiral
1 Yawgmoth’s Bargain
1 Glimpse of Nature
1 Beck // Call
1 Ancestral Recall
1 Treasure Cruise
1 Dig Through Time

4) Filtering

Tier1:
1 Brainstorm
1 Sensei’s Divining Top
1 Ponder
1 Preordain
Tier2:
1 Portent
1 Serum Visions
1 Thought Scour
1 Mental Note
1 Ancient Stirrings
Tier3:
1 Opt
1 Peek
1 Sleight of Hand
1 Clairvoyance
1 Think Twice
1 Oath of Nissa
1 Impulse
1 Peer Through Depths
1 Quicken
1 Mishra's Bauble
1 Urza's Bauble
Tier4:
1 Careful Study
1 Faithless Looting
1 Anticipate
1 Chart a Course
1 Omen
1 Predict
1 Grizzly Salvage

5) Counters

1 Mana Drain
1 Force of Will
1 Counterspell
1 Cryptic Command
1 Mana Leak
1 Remand
1 Mystic Confluence
1 Spell Snare
1 Negate
1 Miscalculation
1 Daze
1 Force Spike
1 Mana Tithe
1 Spell Pierce
1 Dispel
1 Censor
1 Logic Knot
1 Condescend
1 Countersquall
1 Counterflux
1 Absorb
1 Undermine
1 Disallow
1 Prohibit
1 Memory Lapse
1 Delay
1 Deprive
1 Muddle the Mixture
1 Overwhelming Denial
1 Pact of Negation
1 Evasive Action
1 Voidslime
1 Supreme Will
1 Flusterstorm
1 Arcane Denial
1 Mental Misstep
1 Rune Snag
1 Izzet Charm
1 Dismiss
1 Desertion
1 Exclude
1 Mystic Snake
1 Bant Charm
1 Scatter to the Wind
1 Dissolve
1 Stubborn Denial
1 Swan Song
1 Power Sink
1 Disrupting Shoal
1 Spell Swindle
1 Insidious Will
1 Confirm Suspicions
1 Summary Dismissal
1 Dream Fracture
1 Mystic Genesis
1 Plasm Capture
1 Dissipate
1 Rewind
1 Dromar’s Charm
1 Forbid
1 Foil
1 Thwart
1 Annul
1 Red Elemental Blast/Pyroblast
1 Cancel
1 Familiar’s Ruse
1 Faerie Trickery
1 Stoic Rebuttal

6) Land mana
1 Ancient Tomb
1 City of Traitors
1 Crystal Vein
1 Lake of the Dead
1 Ebon Stronghold
1 Dwarven Ruins
1 Havenwood Battleground
1 Ruins of Trokair
1 Svyelunite Temple
1 Gemstone Caverns
1 Peat Bog
1 Hickory Woodlot
1 Remote Farm
1 Sandstone Needle
1 Sapprazzan Skerry
1 Phyrexian Tower