Incursion Specialist — ruling 1

Incursion Specialist’s ability can trigger only once each turn. The ability will resolve before the second spell resolves. It doesn’t matter if the first spell you cast that turn has resolved, was countered, or is still on the stack.

Incursion Specialist : règles, fonctionnement et interactions (MTG)

Incursion Specialist 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

Whenever you cast your second spell each turn, this creature gets +2/+0 until end of turn and can't be blocked this turn.

How it works : Incursion Specialist

Original English text — Wizards of the Coast / Scryfall

#1January 24, 2013· Wizards of the Coast
Incursion Specialist’s ability can trigger only once each turn. The ability will resolve before the second spell resolves. It doesn’t matter if the first spell you cast that turn has resolved, was countered, or is still on the stack.
No other card is named in this ruling.