Thrull Wizard — ruling 1

You can use this ability multiple times on one spell to force your opponent to use more than one mana to prevent the spell from being countered. You can even use this ability, let them pay, then use this ability repeatedly.

Thrull Wizard : règles, fonctionnement et interactions (MTG)

Thrull Wizard 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

: Counter target black spell unless that spell's controller pays or .

How it works : Thrull Wizard

Original English text — Wizards of the Coast / Scryfall

#1October 4, 2004· Wizards of the Coast
You can use this ability multiple times on one spell to force your opponent to use more than one mana to prevent the spell from being countered. You can even use this ability, let them pay, then use this ability repeatedly.
No other card is named in this ruling.