When the AE2 input bus is connected to the mana spreader， it can achieve Infinite mana
Botania-1.18.2-435
Applied-Botanics-1.0.3
appliedenergistics2-forge-11.7.6
1.18.2Forge 40.2.21

Manually released for 1.18.2

Seems like a Botania bug in this version, where the mana spreader allows for negative mana but is just clamped above

    public void receiveMana(int mana) {
        this.mana = Math.min(this.mana + mana, this.getMaxMana());
        this.setChanged();
    }