parser: `under their control` binding unparsed — permanents enter under the wrong controller (CR 110.2a)

[mike-theDude]

Summary

crates/engine/src/parser/oracle_effect/lower.rs handles " under your control", " under their owners' control", and " under its owner's control", but " under their control" falls through a catch-all to enters_under: None.

Per CR 110.2a — "If an effect instructs a player to put an object onto the battlefield, that object enters the battlefield under that player's control unless the effect states otherwise" — the permanent should enter under the named player's control. Instead it enters under the owner's/controller's, silently inverting the card.

Affected cards (~10)

Jailbreak · Endless Whispers · Dubious Challenge · Plague Reaver · Gerrymandering · Immortal Obligation · Turtle Tracks · Occupation of Kulrath · Occupation of Llanowar · The Beamtown Bullies

Two distinct parse paths — a fix must cover BOTH

1. Player-subject path (The Beamtown Bullies)
Reaches lower_subject_predicate_ast. As of #6689 this carries an Effect::unimplemented("enters_under_their_control", …) marker, so coverage correctly reports supported: false, gap_count: 1.

2. Pure-imperative path (Jailbreak, Turtle Tracks, Endless Whispers) — still silently wrong
Reaches try_parse_put_zone_change_parts directly, where the new guard cannot see it. These still export supported: true, gap_count: 0 while inverting the controller.

Jailbreak: "Return target permanent card in an opponent's graveyard to the battlefield under their control."
Cast it on an opponent's creature card and the creature enters under your control — the opposite of what the card says, reported as fully supported.

This second path is a live wrong-game-result bug, not merely a coverage gap.

The runtime is already capable

resolve_enters_under_player routes through controller_ref_player, and crates/engine/src/game/effects/change_zone.rs has a passing test covering ControllerRef::TargetPlayer. The work is parser-side, plus wiring a target-slot carrier so the binding has a player reference to resolve against.

Implementation warning

try_parse_put_zone_change_parts is not a safe place to emit a gap effect. Its caller in crates/engine/src/parser/oracle_effect/imperative.rs matches only Effect::ChangeZone/ChangeZoneAll and returns None for anything else, so returning a gap effect there collapses the entire clause to Unimplemented { name: "put" }, destroying the surrounding parse. This was hit and backed out during #6689.

Ordering

For The Beamtown Bullies specifically, land this together with the activation blocker (companion issue) — see the warning there. Fixing that one alone inverts the card.

Pointers

• crates/engine/src/parser/oracle_effect/lower.rs — the enters_under alternation
• crates/engine/src/game/effects/change_zone.rs — resolve_enters_under_player (already correct)
• Related: The Beamtown Bullies doesn't work at all — [[The Beamtown Bullies]] can not put a creature from your yard on opponents… #6496, fix(engine): scope "target opponent whose turn it is" to the active opponent (#6496) #6689