It's a once only though, so 6 shards for 6 revenge kills. So it isn't *that* OP surely?
Could I use it with Spark to kill off far more expensive targets?
Does it have a chance of getting Immortal or Burrowed Creatures?
If there is no valid target will the shard be used without effect, ie there is no target to take revenge on?
Well the effect is random, so yes, it should be able to take down a more expensive target.
As burrowed and immaterial are untargetable I'd say that it wouldn't affect Immaterials
And, to the last one, yes, I think so.
Thank you- I hadn't considered these