Foe-Razer Regent — ruling 1

You choose the target of the first triggered ability as it goes on the stack, but you choose whether or not to fight as that ability resolves.

Foe-Razer Regent — ruling 2

If the target creature you don’t control becomes an illegal target of the first triggered ability before it resolves, Foe-Razer Regent won’t fight and its last ability won’t trigger.

Foe-Razer Regent — ruling 3

If a creature you control fights during an end step, the delayed triggered ability that puts +1/+1 counters on that creature won’t trigger until the beginning of the following turn’s end step.

Foe-Razer Regent : règles, fonctionnement et interactions (MTG)

Foe-Razer Regent 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 When this creature enters, you may have it fight target creature you don't control. Whenever a creature you control fights, put two +1/+1 counters on it at the beginning of the next end step.

How it works : Foe-Razer Regent

Original English text — Wizards of the Coast / Scryfall

#1February 25, 2015· Wizards of the Coast
You choose the target of the first triggered ability as it goes on the stack, but you choose whether or not to fight as that ability resolves.
No other card is named in this ruling.
#2February 25, 2015· Wizards of the Coast
If the target creature you don’t control becomes an illegal target of the first triggered ability before it resolves, Foe-Razer Regent won’t fight and its last ability won’t trigger.
No other card is named in this ruling.
#3February 25, 2015· Wizards of the Coast
If a creature you control fights during an end step, the delayed triggered ability that puts +1/+1 counters on that creature won’t trigger until the beginning of the following turn’s end step.
No other card is named in this ruling.