Tempered in Solitude — ruling 1

A creature attacks alone if it's the only creature declared as an attacker during the declare attackers step. For example, Tempered in Solitude's ability won't trigger if you attack with multiple creatures and all but one of them are removed from combat.

Tempered in Solitude — ruling 2

You must pay all costs and follow all normal timing rules to play a card this way. For example, you may play a land this way only during your main phase while the stack is empty, and only if you haven't yet played a land this turn.

Tempered in Solitude : règles, fonctionnement et interactions (MTG)

Tempered in Solitude 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 a creature you control attacks alone, exile the top card of your library. You may play that card this turn.

How it works : Tempered in Solitude

Original English text — Wizards of the Coast / Scryfall

#1February 18, 2022· Wizards of the Coast
A creature attacks alone if it's the only creature declared as an attacker during the declare attackers step. For example, Tempered in Solitude's ability won't trigger if you attack with multiple creatures and all but one of them are removed from combat.
No other card is named in this ruling.
#2February 18, 2022· Wizards of the Coast
You must pay all costs and follow all normal timing rules to play a card this way. For example, you may play a land this way only during your main phase while the stack is empty, and only if you haven't yet played a land this turn.
No other card is named in this ruling.