* Now player must choose additional costs before ability's modes;
* Fixed broken kicker ability from ZNR (see comments from d4ca287f0f);
* Improved compatibility of additional cost with cost modification effects (fixed that optional multi-costs doesn't affected by cost modification);
* Improved compatibility of additional cost with alternative cost (some cards ignores additional cost on alternative usage, e.g. on play free);
* added mill method
* updated mill effects to use new method
* refactored individual cards
* small updated to Grindstone and Sphinx's Tutelage
* another updated to Grindstone
* fixed a test
* fixed Countermand null check
* more refactoring
* updated dredge ability to use mill
* now it can be used to calc and find available mana and playable abilities;
* now tests and AI can use that abilities;
* now it follows mtg's rules and restrictions for mana activation order (rule 601.2f, see #768);
* added new discard method
* started refactoring to use new discard method
* refactored A through I
* fixed some issues
* separated balance effect into its own class
* refactored J through R
* refactored S through Z
* applied requested changes
* fixed wrong manually pay by mana pool (it pays generic cost instead colored part of monohybrid);
* fixed not working cost reduction effects (now monohybrid cost will be reduced correctly with some limitation, see #6130);
Replaced all instances of "her or she", "him or her", and "his or her", with "they", "them", and "their", or sometimes "that player". Updated verbs where appropriate.
* K'rrik fixes, payment for triggered abilities
K'rrik's Phyrexian ability is now handled separately from actual Phyrexian mana costs. It can now be used to pay for triggered abilities like Extort.
* K'rrik tests added
Tests include:
- only usable by 1 player
- usable with activated/triggered abilities
- usable as an alternative to true Phyrexian mana, getting around Trinisphere
* Pay X abilities - fixed that it spends all available mana pool instead only needed;
* Pay X abilities - added support of interactions with other X effects like Rosheen Meanderer's mana usage for "pay X to prevent";
* Rosheen Meanderer - fixed that it can't use mana for "you may pay X" like Flameblast Dragon's effect (#5206);
* Devs: added support to use VariableManaCost to pay X in code (without generic's workaround, use ManaUtil.createManaCost to generate cost to pay);
