Gameplan:

Step 1: Play Kalamax
Step 2: Tap Kalamax
Step 3: Play ONE Value-Instant each turn if possible (i.e. Harrow, Thrill of Possibility, Eureka Moment, Unexpected Windfall, Return of the Wildspeaker etc.)
Step 4: Profit!
Step 5: Close out the Game through the massive Burn spells or good, old fashioned beats.

Chord of Calling lines:

Go-to Choices ->
for X = 3 : Veyran, Voice of Duality + Tireless Provisioner (Safety choice: Good Value + Ramp)
for X = 4 : Storm-Kiln Artist + Archmage Emeritus (Draw choice) / Rashmi, Eternities Crafter (Value choice) / Silent Arbiter (Survival Choice) / Galazeth Prismari (Maximum Ramp)
for X = 5 : Seedborn Muse + any 4 Drop that fits the situation.

Crop Rotation lines:

Go-to choice: Alchemist's Refuge + Reliquary Tower
Situational choices: Holdout Settlement, Survivors' Encampment, Scavenger Grounds, Homeward Path

Narset's Reversal:

Kalamax, the Stormsire tapped + Naset's Reversal goes infinite, as with Narset's Reversal you can get continuous value with it by using the copy (Kalamax) to target your own Reversal. This will create another copy, which can target the original spell your opponent has cast. Thus, you gain the effect your opponent intended and return both Narset's Reversal and your opponents spell to their owners hand. As a bonus, this process will always give Kalamax at least three +1/+1 counters everytime.

Tapping Kalamax:

It is crucial to always be able to Tap Kalamax. This List uses two methods to ensure this:

1. Tapping untapped creature:
   Chord of Calling, Holdout Settlement, Honor-Worn Shaku, Springleaf Drum, Survivors' Encampment
   This Method has the advantage of ignoring summoning sickness.

2. Unblockable Kalamax:
   Aqueous Form, Prowler's Helm, Trailblazer's Boots, Rogue's Passage
   This doubles up as a backup wincondition, as Kalamax can get huge pretty quickly. It is realistic to take out an opponent via commander damage in 2-3 swings. Especially when using the combat line or Unleash Fury.

Note: When Kalamax has no counters, Unleash Fury + Copy will give him a power of 20. With one +1/+1 counter it will be 24. Keep this in mind when going for the kill via commander damage.

Strengths & Weaknesses

Strength:

• Massiv value during the entire turncycle
• Consistent Win-Condition
• Doubled interaction
• Not very Commander dependant (Swarm Intelligence ,Double Vision, Jin-Gitaxias, Progress Tyrant, Rashmi, Eternities Crafter can serve as substitutes for Kalamax)

Weaknesses:

• Little to no defense against creature combat
• Not much Protection for Kalamax
• Lack of Lifegain Options

Note: The deck isn't fully streamlined, but is more of a collection of ideas that work well together.