[SLD] Implement Captain America, First Avenger

[Grath]

I made assumptions that WotC is going to fix this card to actually work by adding "choose the equipment you're unattaching with Throw..." (in some way) to rule 601.2b since you have to choose a TargetAnyTargetAmount in steps 601.2c/601.2d long before you actually pay the unattach cost in 601.2h; the way I implemented it, you're technically choosing the equipment at the beginning of 601.2c instead of during 601.2b but it's functionally identical.

[JayDi85]

Targets workaround looks strange. There are dozen cards with same effects: https://scryfall.com/search?q=o%3A%22divided+as+you+choose+among%22&unique=cards&as=grid&order=name

Example: [[Arc Mage]] or [[Infernal Harvest]]

Need some research, looks like game engine need some improves to fully support early choices due rules. Or something wrong with card implementation (cost usage and choice propagation for a target like X values).

[github-actions]

Arc Mage - (Gatherer) (Scryfall) (EDHREC)

{2}{R}
Creature — Human Spellshaper
2/2
{2}{R}, {T}, Discard a card: Arc Mage deals 2 damage divided as you choose among one or two targets.

Infernal Harvest - (Gatherer) (Scryfall) (EDHREC)

{1}{B}
Sorcery
As an additional cost to cast this spell, return X Swamps you control to their owner's hand.
Infernal Harvest deals X damage divided as you choose among any number of target creatures.

[Grath]

That's false, there is one card with a similar effect to this one and it's [[Nahiri's Sacrifice]] which uses "declare the value of X in step 601.2b" to be able to know how much damage is being divided and how many targets you can target.

[github-actions]

Nahiri's Sacrifice - (Gatherer) (Scryfall) (EDHREC)

{1}{R}
Sorcery
As an additional cost to cast this spell, sacrifice an artifact or creature with mana value X.
Nahiri's Sacrifice deals X damage divided as you choose among any number of target creatures.

[Grath]

Options we have:

1. Dig through the guts of AbilityImpl to do a functionally equivalent one-off engine-level workaround to add "choose the equipment you're going to unattach early" if there's a CaptainAmericaFirstAvengerUnattachCost present in the ability.
2. This target workaround, where instead of doing it during 601.2b handling we do it at the beginning of 601.2c handling.

[Grath]

Targets workaround looks strange. There are dozen cards with same effects: https://scryfall.com/search?q=o%3A%22divided+as+you+choose+among%22&unique=cards&as=grid&order=name

Example: [[Arc Mage]] or [[Infernal Harvest]]

Need some research, looks like game engine need some improves to fully support early choices due rules. Or something wrong with card implementation (cost usage and choice propagation for a target like X values).

Workaround removed, did the engine improvement to support costs which must be chosen during 601.2b

[xenohedron]

I have a few minor comments here but the overall direction with EarlyTargetCost looks good to me.

[Grath]

@JayDi85 I'm going to merge this once Travis passes, because I have removed the workaround which you objected to when you self-assigned it.