Move paying life from ability costs to effects for generality
Similarly move sacrifice from ability cost to effect
Fix activated ability instruction parsing; parse discard
Move remove counter effect from ability costs to effects
Implement putting counters on permanents
Implement basic 'put tokens onto the battlefield' parsing
Support optional player targets in sacrifice effects
Implement basic 'gain control of' effect
Support 'gain control until ...' triggerevent
Define duration for exile, gain control effects
When searching for 'equal to ' and ', where X is', don't search past a '.'
Implement basic add ability with a duration ('gain') effect
Implement basic power/toughness modifying effects
Reimplement loyalty cost in terms of NumChange