add-replacement-effect

To implement ETB tapped replacement effects, wire a ReplacementDefinition into the pipeline that modifies the proposed entering event, marking the object as tapped before it resolves on the battlefield.

A replacement effect pipeline intercepts proposed events before they resolve, applying mandatory or optional modifications like damage prevention or entering tapped, using defined ReplacementEvent types and ReplacementMode variants.

Model shock land choices using optional ReplacementMode, triggering an interactive pre-zone-change prompt that asks the player whether to pay life, then applying the modified event to the entering object.

Mandatory replacement modes automatically apply event modifications like damage prevention, while optional modes require interactive player choices, both managed through the ReplacementDefinition structure and pipeline flow.

Register new replacement effects by updating the engine registry with the ReplacementDefinition, integrating the parser to recognize the ability syntax, and ensuring the pipeline processes pre- and post-zone-change behavior.

Yes, the replacement pipeline supports post-replacement effects, allowing you to define behavior that triggers after the modified event resolves on the battlefield, completing the end-to-end lifecycle.