Stromkirk Captain — ruling 1

If a creature with first strike deals damage in the first combat damage step, but then loses first strike before regular combat damage, it won't deal combat damage a second time (unless it also has double strike).

Stromkirk Captain : règles, fonctionnement et interactions (MTG)

Stromkirk Captain is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

First strike Other Vampire creatures you control get +1/+1 and have first strike.

How it works : Stromkirk Captain

Original English text — Wizards of the Coast / Scryfall

#1January 22, 2011· Wizards of the Coast
If a creature with first strike deals damage in the first combat damage step, but then loses first strike before regular combat damage, it won't deal combat damage a second time (unless it also has double strike).
No other card is named in this ruling.