It would be really cool to have an expansion themed around those WoW ancient temple rainforest zones (WoW players know what I'm talking about). The ones that were/are inhabited by forest trolls.
Zul'Gurub or something?
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...The problem is not the problem, the problem is your attitude to the problem.
Look up noxious' mekkatorque workshop cards. One of them is based on "the voodoo" which are reminiscent to spare parts in a way. What I'm saying is that you could a troll archetype which works with "voodoo" cards. Lich king has death knights so you could do something similar to that with a legendary and maybe some spell that grants voodoo cards for every troll that has died this game.
I actually made a few cards that were revolving around a very comparable mechanic, called mojo. Few troll cards would give mojo cards (as part of their battlecry/deathrattle things) that what resemble death knight cards in many aspects save for one thing: few of them would increase in power for every friendly troll who died, while said mojo card was in your hand.
For instance :
3 mana: Mojo (X) Deal 1 damage to all enemy minions (deal 1 extra mana for every mojo point acquired). In other words, it could very quickly become a 3 mana Deal 5 damage to all enemy minions.
3 mana: Mojo (X) Restore 6 health.
Others wouldn't have the Mojo mechanic and solely give a mild buff.
And some other cards would have synergy with mojo cards
Of course, these are just ideas i'm throwing around here - no serious balancing so far...
...The problem is not the problem, the problem is your attitude to the problem.
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