#159 Modify and Test Against Ability Costs

[David Taylor]

I would like to be able to use a static modifier to change the activation costs for abilities other than casting a spell.

This would make it possible to create cards like Heartstone.

For this purpose it would also be beneficial to test the cost first to prevent the resulting mana-costs to become negative. Another option would be for the modifier to present a minimum cost it can result in.