Revisiting Runes

[jdoleary]

• Runes should be reversible (maybe you can buy and sell them)

Runes can be simple:

• All summoned units deteriorate after 3 turns
• Every dead unit drops a stamina potion
• Movement spells are 2x cheaper to cast
• Curses are 2x more likely to appear
• SneakyMinion — a rune could make all spells cost half as much but doubles the cost-ramping.

Revisit #143