Quick Analysis:

This build is an early game build for [Excalibur]. This build optimizes movement ([Rush], [Heavy Impact]) and loot hunting capabilities ([Thief's Wit]) while maintaining defenses through upgraded shield ([Fast Deflection], [Redirection]), health (Vitality), and armor (Steel Fiber). As a result, this warframe is best suited for running through levels to find treasures / loot.

All of the mods in this build are easily attainable early game. This build will last you until mid-late game story progression, where it can be easily upgraded. Moreover, this build only requires a single orokin reactor and no forma at all! Clocking in at a little over 3,000 endo, this build is also extremely affordable and won't break the bank.

Detailed Breakdown:

(Offensive & Loot Finding)

• Steel Charge: +60% Melee Damage (Melee weapons are main source of damage)
• Thief's Wit: +42 Loot Radar (Treasure hunting capabilities)

(Defensive)

• Fast Deflection: +90% Shield Recharge (Works with Redirection to always keep up shield. Good against Grineer and Corpus.)
• Redirection: +200% Shield Capacity (Works with Fast Deflection to always keep up shield. Good against Grineer and Corpus.)
  - Vitality: +280% Health (Especially useful against Infestation because they can directly hit health)
• Steel Fiber: +50% Armor (Armor reduces damage taken, so helps in all situations)

(Abilities & Team Centered)

• Streamline: +25% Ability Efficiency (Lots of Excalibur's abilities are centered around increased movement or melee attacks)
• Purging Slash: Excalibur's Unique Augment --> (Allies in the path of Excalibur's "Slash Dash" ability have 1 debuff removed and all shield restored)

(Movement)

• Rush: +20% Sprint Speed (Works with other movement buffs to exponentially increase movement)
• [Heavy Impact]: Create 4m seismic waves, deal 200 damage, and knock enemies away via hard landings (helps with damage control and movement)