Hearthstone Battlegrounds: How to Build a 21x Blood Gem Multiplier Board

To build a 21-cast Blood Gem board in Hearthstone Battlegrounds, combine Charlga with a Golden Drakkari Enchanter on a full seven-minion board. A baseline Charlga casts one Blood Gem on every friendly minion at the end of your turn, producing seven gems across a full warband. Golden Drakkari Enchanter forces end-of-turn effects to trigger three times, immediately multiplying those seven casts into 21 automated Blood Gem buffs per turn.

Executing this strategy requires raising the base stats of your Blood Gems during the early and mid-game before transitioning into multiplier units.

Blood Gem Multiplier Math

The scaling output depends on whether your end-of-turn engines are standard or golden, as well as whether you supplement them with manual cast triggers.

Standard Charlga + Golden Drakkari Enchanter: Charlga targets all seven friendly minions once (7 gems). Golden Drakkari triggers the effect three times, resulting in 21 Blood Gems per turn.
Golden Charlga + Golden Drakkari Enchanter: Golden Charlga casts two Blood Gems per friendly minion (14 gems per activation). Golden Drakkari triples this output to 42 Blood Gems per turn.
Geomagus Roogug Integration: Golden Roogug plays two additional Blood Gems onto different friendly minion types whenever a gem is applied to him. Manually targeting Roogug or letting Charlga buff him distributes additional secondary gems across your board.

Multiplying flat +1/+1 gems produces negligible stat gains against late-game lobbies. Raising your gems to at least +5/+5 before establishing the engine ensures that a 21-gem turn delivers a minimum of +105/+105 in total board stats every round.

Core Minions and Roles

Assembling this board requires transitioning through dedicated stat buffers, mid-game bridges, and late-game multiplier engines.

Minion	Tavern Tier	Core Role	Strategic Function
Prickly Piper	Tier 3	Attack Buffer	Increases Blood Gem Attack scaling permanently.
Moon-Bacon Jazzer	Tier 3	Health Buffer	Increases Blood Gem Health scaling permanently.
Gem Smuggler	Tier 4	Mid-Game Bridge	Distributes gems across the board to preserve Health before finding Tier 6 units.
Geomagus Roogug	Tier 5	Secondary Replicator	Plays extra gems onto other minion types when buffed directly.
Drakkari Enchanter	Tier 5	Trigger Multiplier	Doubles (base) or triples (golden) end-of-turn activations.
Charlga	Tier 6	Mass Engine	Casts Blood Gems on all friendly minions at the end of the turn.
Pokey Thornmantle	Tier 6	Value Accelerator	Permanently increases Blood Gem stats by +1/+1 at the end of each turn.

Transition Steps and Execution

Pivoting into high-tier multiplier minions causes a temporary drop in combat strength if your board lacks raw stats. Follow this sequence to assemble the engine safely:

Build Baseline Gem Value: Purchase Prickly Piper and Moon-Bacon Jazzer during the mid-game until your Blood Gems provide at least +4/+4.
Preserve Health with Tempo Units: Use Gem Smuggler to distribute stats across your board to stay alive while leveling to Tier 5 and Tier 6.
Anchor the Engine with Charlga: Do not place an unbuffed Drakkari Enchanter onto your board until Charlga or Pokey Thornmantle is active. Multipliers offer zero value without an end-of-turn generator.
Target Drakkari Enchanter Directly: Manually apply Blood Gems to Drakkari Enchanter immediately after playing it. Because Drakkari is not a Quilboar, it relies on manual gems or Charlga triggers to survive combat attacks.
Triple Key Pieces: Seek triples on Drakkari Enchanter to upgrade the end-of-turn multiplier from two triggers to three, and on Charlga to double base output.

Positioning Rules

Protecting fragile utility units from enemy attacks ensures your multiplier pieces survive round after round:

Slot 1 (Leftmost): Place your largest combat carry or a high-stat Divine Shield minion first to trade into opposing threats immediately.
Slot 2: Position your secondary combat minion to clear follow-up targets and protect the rest of your board from wide cleave attacks.
Slots 3 and 4: Place flexible slots, such as Geomagus Roogug or secondary Quilboar carries. When running Roogug, include multiple minion types to maximize his secondary gem distribution.
Slots 5 and 6: Place Drakkari Enchanter and Pokey Thornmantle away from the corners and primary attack angles to prevent stray cleave damage from sniping them.
Slot 7 (Rightmost): Position Charlga in the back row.

In the final rounds, opponents will often buy Leeroy Jenkins or Venomous minions to trade into massive single-target stats. Counter these tech options by using your passive turn scaling to buy, place, and instantly stat Divine Shield minions without breaking your core Charlga and Drakkari engine.