manabrew_engine/spellability/
alternative_cost.rs

1//! Alternative casting costs for spells and abilities.
2//!
3//! Mirrors Java's `AlternativeCost` — tracks how a spell was cast so resolution
4//! can apply the correct behaviour (e.g. Evoke -> sacrifice on ETB, Dash -> haste + bounce).
5
6use serde::{Deserialize, Serialize};
7
8/// Alternative casting costs — mirrors Java's `AlternativeCost`.
9/// Tracks how a spell was cast so resolution can apply the correct behaviour.
10#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
11pub enum AlternativeCost {
12    Flashback,
13    Spectacle,
14    Evoke,
15    Dash,
16    Blitz,
17    Escape,
18    Overload,
19    Madness,
20    Foretell,
21    Emerge,
22    Suspend,
23    /// Cast face-down as a 2/2 creature for {3} (Morph).
24    Morph,
25    /// Cast face-down as a 2/2 creature for {3}, +1/+1 counter on turn face-up (Megamorph).
26    Megamorph,
27    /// Cast as an Aura with enchant creature for the bestow cost.
28    Bestow,
29    /// Cast for warp cost; exile at beginning of next end step.
30    Warp,
31    /// Sacrifice-based alternative cost (e.g. Fireblast: sacrifice two Mountains).
32    SacrificeAlt,
33    /// Cast a plotted card from exile for free.
34    Plot,
35    /// Awaken — cast with awaken cost to animate a land.
36    Awaken,
37    /// Disturb — cast from graveyard transformed.
38    Disturb,
39    /// Harmonize — alternative cost for harmony effects.
40    Harmonize,
41    /// Freerunning — reduced cost when dealing combat damage.
42    Freerunning,
43    /// Impending — cast as a non-creature with time counters.
44    Impending,
45    /// Mayhem — alternative cost for mayhem effects.
46    Mayhem,
47    /// MTMtE — More Than Meets the Eye (Transformers) alternative cost.
48    MTMtE,
49    /// Mutate — cast on top of or under another creature.
50    Mutate,
51    /// Prowl — reduced cost when a creature of the same type dealt combat damage.
52    Prowl,
53    /// Sneak — alternative cost for sneaking into play.
54    Sneak,
55    /// Surge — reduced cost when you or a teammate cast another spell this turn.
56    Surge,
57    /// WebSlinging — alternative cost for web-slinging effects.
58    WebSlinging,
59    /// Plotted — the card was previously plotted and is now being cast.
60    Plotted,
61}
62
63impl AlternativeCost {
64    /// True if this is a morph-style face-down cast (Morph or Megamorph).
65    pub fn is_morph(self) -> bool {
66        matches!(self, AlternativeCost::Morph | AlternativeCost::Megamorph)
67    }
68}
69
70/// Generic mana cost for casting a card face-down via Morph/Megamorph ({3}).
71pub const MORPH_GENERIC_COST: i32 = 3;
72
73/// Power and toughness of a face-down morph creature.
74pub const MORPH_PT: i32 = 2;
manabrew_engine/spellability/alternative_cost.rs

manabrew_engine/spellability/
alternative_cost.rs
