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So I am currently poking at the Rebound keyword and,well, so far so good. The card exiles properly without going to the graveyard and gets cast again your next upkeep. There is a problem I've been banging my head on for a while,though, namely that the card keeps it's target (I've been testing with Staggershock) for the second casting. i.e. if I target an Ornithopter and send it to the graveyard, at my next upkeep it will cast for free and try to target the same Ornithopter(still in the graveyard) without setting a targeting input state. I've been trawling through the SpellAbility,Target and GameActionUtil classes to figure out why it skips the input state or how I can reset the targeting.I would greatly appreciate it if anyone with more insight into those classes has any ideas to share.

The code so far:
GameActionUtil.java:

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   public static CardList Rebounded_Human = new CardList();
   public static CardList Rebounded_AI = new CardList();
   
   public static void executeUpkeepEffects() {

      if(AllZone.GameAction.isPlayerTurn(AllZone.HumanPlayer))
      {
         for(Card c : Rebounded_Human)
         {
            AllZone.GameAction.playCardNoCost(c); //Same method that cascade uses
         }
         
         Rebounded_Human.clear();
      }
      else
      {
         for(Card c : Rebounded_AI)
         {
            if(c.getSpellAbility()[0].canPlayAI())
            {
               AllZone.GameAction.playCardNoCost(c);
            }
         }
         Rebounded_AI.clear();
      }
...Nothing changed afterwards...

in CardFactory.java:

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        if(hasKeyword(card,"Rebound") != -1) {
           final Command graveyardReplacer = new Command() {
            private static final long serialVersionUID = 1489845860231758299L;

            public void execute() {
                 AllZone.GameAction.exile(card);
                 if(card.getController() == AllZone.HumanPlayer)
                 {
                    GameActionUtil.Rebounded_Human.add(card);
                 }
                 else
                 {
                    GameActionUtil.Rebounded_AI.add(card);
                 }
                 card.clearReplaceMoveToGraveyardCommandList();
              }
           };
           
           card.addReplaceMoveToGraveyardCommand(graveyardReplacer);
           
        }

staggershock.txt

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Name:Staggershock
ManaCost:2 R
Types:Instant
Text:no text
A:SP$DealDamage|Cost$2 R|Tgt$TgtCP|NumDmg$2|SpellDescription$CARDNAME deals 2 damage to target creature or player.
K:Rebound
End

Note that this will still fail if you bring back the card from the graveyard after it has rebounded. It won't rebound a second time. I'm looking at ZCTriggers to fix that,though.Also, the AI playing for free is probably incorrect ATM. But the targeting is the big deal right now. =P

Dennis came accross a similar problem with Flashback. Flashback would work correctly only for spells that did not target. We have a Flashback keyword that currently only works for non-targeted spells.

For targeted Flashback spells, Denenis came up with a hack of sorts. Check out Strangling Soot and Firebolt. It is possible that you could try something similar. It might be worth it to look at these two spells.

It's probably easier than that. We can just clear out the target state after the spell resolves right around the same time that it would goto the graveyard (or wherever). We could do this for ALL spells, and that way Flashback or Rebound (or anything) wouldn't just reuse the same old target if it still remembers it.

My Phase work moved where ResolveStack is occurring (it's now in the MagicStack object) so I could add in a block that can reset the Target there. If you need more immediate satisfaction, just look here

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if (sa.isFlashBackAbility())
   c.replaceMoveToGraveyard();


and do something like this right before it:

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sa.setTargetPlayer(null);
sa.setTargetCard(null);


Hmm, for Flashback, I don't think it was using the same target, but it was just that the targeting didn't happen at all.
I don't remember exactly though, it was a long time ago.

Wait a second. This problem is actually somewhere else.

It looks like playCardNoCost() calls playSpellAbilityForFree() which doesn't have a block of code for handling Spells that use the Target object. That probably means that Cascade is currently broken for any Spells that use the Target object. The solution then would be to add a block in the beginning of playSellAbilityForFree() that looks something like this:

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sa.setActivatingPlayer(AllZone.HumanPlayer);
if (sa.getPayCosts() != null){
   Target_Selection ts = new Target_Selection(sa.getTarget(), sa);

       Ability_Cost abCost = sa.getPayCosts();
        abCost.changeCost(sa);
        abCost.setMana("0");
   Cost_Payment payment = new Cost_Payment(abCost, sa);
   
   SpellAbility_Requirements req = new SpellAbility_Requirements(sa, ts, payment);
   req.fillRequirements();
}
else
// the rest of the funcion here


Also, I'm pretty sure these functions above are for Humans only. The AI should use something in ComputerUtil. Although it seems like those functions aren't as up-to-date as they should be.

I also just realized. Will this create an infinite rebound spell?
Technically, a spell will only rebound if you cast it from your hand (not from exile or the grave or the library).

True, I converted Lightning Bolt to use AbilityFactories and failed to cascade into it as predicted. However, with the fixed codeblock at the beginning of playSpellAbilityForFree, there is a NullPointerException in SpellAbility_Requirements when it tries to get the zone of the card that was paid for free.(It is removed from the library before playcardNoCost is called) I fixed this by actually making the code more true to the actual mechanic, in that it now exiles cards until a suitable one is found, instead of only removing them from the library without adding them anywhere else. It still however, does this when the Rebound code tries to playCardNoCost, so somewhere the card is being removed from exile without being added anywhere else. I've looked but there's not many places between playCardNoCost and fillRequirements where it can happen.

I have another appointment atm, so this post is as much for meyself get back as anything else.

EDIT: fillRequirements() gets called twice when the card is cast from exile, for some reason...