Once you have enough regen, Hood the Rabbit + Wind Mace is an unstoppable combo.
Spam rabbits and use the mace whenever enemies get too close, the rabbits will pile up and form a line, destroying everything in their way once enough are stacked together.
Tip: Later on when you have a surplus of mana, build one gem surrounded by 8 amplifiers. Something like chain hit/multiple damage, and just keep upgrading them evenly, impossible to lose.
Lol I made an assassin virus. Like 20 infectivity with 0 lethality and visibility. Waited till every country was infected then turned up the deadliness.