add-replacement-effect

To implement MTG replacement effects, you define a ReplacementDefinition, wire it into the engine registry, and validate it through the parsing pipeline to handle event-modifying abilities like enters-tapped and damage prevention.

Parsing Oracle text for MTG replacement effects extracts ability definitions from the text and configures them as Mandatory or Optional modes, enabling pre-zone-change interactive choices and subsequent post-replacement event handling.

The best way to wire pre-zone-change interactive choices for ETB replacement effects is by configuring Optional decline modes within the ReplacementDefinition and hooking them into the engine pipeline before zone changes occur.

Yes, you can handle post-replacement effects automatically by utilizing the engine hooks specified in the replacement pipeline, which manage subsequent actions after the modified event is successfully delivered.

Yes, the MTG engine replacement pipeline supports end-to-end testing by validating the full flow from ReplacementDefinition and registry wiring through to execution and post-replacement handling.

Use Optional decline modes for MTG abilities when players need pre-zone-change interactive choices, whereas Mandatory replacements are required for automatic event modifications like damage prevention.