Daring Fiendbonder — ruling 1

If Daring Fiendbonder can't attack for any reason (such as being tapped), then it doesn't attack. If there's a cost associated with having it attack, the player isn't forced to pay that cost, so it doesn't have to attack in that case either.

Daring Fiendbonder : règles, fonctionnement et interactions (MTG)

Daring Fiendbonder 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

Haste This creature attacks each combat if able. , Exile this card from your graveyard: Put an indestructible counter on target creature. Activate only as a sorcery.

How it works : Daring Fiendbonder

Original English text — Wizards of the Coast / Scryfall

#1April 17, 2020· Wizards of the Coast
If Daring Fiendbonder can't attack for any reason (such as being tapped), then it doesn't attack. If there's a cost associated with having it attack, the player isn't forced to pay that cost, so it doesn't have to attack in that case either.
No other card is named in this ruling.