Thunder Drake — ruling 1

Thunder Drake’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.

Thunder Drake — ruling 2

Thunder Drake must be on the battlefield in order for the ability to function. Notably, the ability won’t trigger if Thunder Drake is the second spell you cast in a turn.

Thunder Drake : règles, fonctionnement et interactions (MTG)

Thunder Drake 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

Flying Whenever you cast your second spell each turn, put a +1/+1 counter on this creature.

How it works : Thunder Drake

Original English text — Wizards of the Coast / Scryfall

#1May 3, 2019· Wizards of the Coast
Thunder Drake’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.
#2May 3, 2019· Wizards of the Coast
Thunder Drake must be on the battlefield in order for the ability to function. Notably, the ability won’t trigger if Thunder Drake is the second spell you cast in a turn.
No other card is named in this ruling.