Heimerdinger
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Good (7/10)
High Investment Required
Paid Relics
Epic Relics
Heimerdinger is a high-variance champion who excels in long-term value generation and board presence. While his power level is significant once his engine is established, he requires substantial investment and specific relics to overcome a naturally slow start. His reliance on the 'Science!' upgrade pool makes him a definitive choice for players who prefer adaptable, non-linear gameplay, though his consistency is lower than top-tier specialists in his regions.
Accelerated Engine
Provides a Round 1 Nexus strike to activate Plunder-based cost reduction and offers defensive sustain through Drain.
Works in tandem with early Nexus damage to reduce Heimerdinger's cost, facilitating a Round 1 or 2 summon.
Essential for converting high-stat turrets into Nexus damage via Overwhelm, while providing a stat boost to the Tech subtype.
Strategy
This build prioritizes summoning Heimerdinger as early as possible. By using Plunder triggers, you bypass his 5-mana cost, allowing the turret-generation engine to begin before the opponent can establish a dominant board. Once Heimerdinger is fielded, every spell cast creates immediate board pressure and keyword scaling.
Hextech Duplication
Doubles the value of all spells once the 6-mana threshold is reached, creating two turrets and two sets of upgrades per cast.
Cheats Heimerdinger onto the board automatically on Round 5, allowing you to save mana for defensive spells in the early game.
Drastically reduces Heimerdinger's cost based on board width, allowing for an explosive mid-game deployment.
Strategy
Focused on the late-game power spike, this build aims to overwhelm the opponent with sheer spell volume. Chemtech Duplicator ensures that every spell cast results in a full board of upgraded Tech units. This is particularly effective in adventures with higher mana caps or longer encounter durations.
Other Relic Options
Provides consistent, high-cost removal that synergizes with Heimerdinger's requirement to spend mana on spells to trigger upgrades.
Grants Heimerdinger the Tech subtype to benefit from his own buffs and provides the Nexus with Tough to survive aggressive early-game encounters.
Protects Heimerdinger from targeted removal, which is critical given the deck's reliance on him remaining on the board to generate value.
The signature relic, Defense Spending, is a niche but effective option for stabilizing against high-aggression adventures like Swain. For general play, prioritizing mana efficiency and keyword delivery is more impactful.
Constellation
Heimerdinger's constellation is heavily weighted toward his 1-star and 3-star upgrades, which define his 'Science!' keyword engine. His progression is notably bottlenecked by fragment nodes, and he requires high star levels to feel competitive in 5-star+ adventures. The Tech subtype integration is his primary scaling mechanic, making 'Tech' focused nodes higher priority than generic stat increases.
Science!
Tech allies in hand and in play have a random upgrade for each time you've spent 6+ mana on spells.
Pursuit of Progress
+1 Starting Mana. When you summon a unit, refill one spell mana.
Science!!! II
Tech allies in hand and in play have a random upgrade from an improved pool of upgrades for each time you've spent 6+ mana on spells.
Biggledust Sprinkle
When you summon a created ally, grant it +1|+1.Review
Provides minor early-game board presence but is generally considered a low-impact upgrade. It serves as a defensive buffer for a slow-starting deck but does not contribute to the core win condition of spell-slinging.
Manaflow
Game Start: Get a mana gem.Review
A mandatory upgrade for high-level content. The additional mana gem is required to reach the 6-mana threshold for Chemtech Duplicator and to deploy Heimerdinger before the opponent can end the game.
Eureka!!!!
Tech allies in hand and in play start the game with 3 random improved upgrades. Game Start: Summon a Mk0: Windup Shredder.Review
Significantly accelerates the scaling process by granting free starting upgrades. While it reduces the tactical depth of managing mana for 'Science!' triggers, it provides a massive statistical advantage that allows Heimerdinger to compete with the fastest decks in the game.
Gameplay Tips
- Manage Board Space Constantly
Heimerdinger occupies one slot, and his turrets can fill the remaining five very quickly. Be careful not to 'obliterate' your own Heimerdinger or high-value Tech units by casting too many spells while the board is full.
- Bait Removal Before Deploying the Engine
Because the deck functions poorly without Heimerdinger on the field, use support champions or early Tech units to bait out enemy removal spells. Do not deploy Heimerdinger unless you have a Spellshield active or enough mana to immediately generate value from his turret creation.
- Prioritize Overwhelm and Elusive Keywords
Since the 'Science!' upgrades are random, your turrets may often lack a way to bypass blockers. Prioritize picking up powers or relics that grant Overwhelm or Elusive to ensure your high-stat Tech units can actually strike the enemy Nexus.
- Draft Target-Heavy Spells
When choosing cards at rewards nodes, prioritize spells that target units. This ensures that if you are using relics like Chemtech Duplicator, the copied spell has a valid target and does not fizzle, ensuring you get the maximum amount of turrets and upgrades.