Silverclad Ferocidons — ruling 1

If lethal damage is dealt to a creature with an enrage ability, that ability triggers. The creature with that enrage ability leaves the battlefield before that ability resolves, so it won't be affected by the resolving ability.

Silverclad Ferocidons — ruling 2

When Silverclad Ferocidons's triggered ability resolves, first the player whose turn it is (if that player is an opponent) chooses which permanent they will sacrifice, then each other opponent in turn order does the same, then all chosen permanents are sacrificed at the same time. Players will know choices made by earlier players when making their choices.

Silverclad Ferocidons — ruling 3

If creatures an opponent controls are dealt lethal damage at the same time that Silverclad Ferocidons is dealt damage, those creatures will be destroyed before that player chooses a permanent to sacrifice.

Silverclad Ferocidons — ruling 4

If multiple sources deal damage to a creature with an enrage ability at the same time, most likely because multiple creatures blocked that creature, the enrage ability triggers only once.

Silverclad Ferocidons : règles, fonctionnement et interactions (MTG)

Silverclad Ferocidons 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

Enrage — Whenever this creature is dealt damage, each opponent sacrifices a permanent of their choice.

How it works : Silverclad Ferocidons

Original English text — Wizards of the Coast / Scryfall

#1January 19, 2018· Wizards of the Coast
If lethal damage is dealt to a creature with an enrage ability, that ability triggers. The creature with that enrage ability leaves the battlefield before that ability resolves, so it won't be affected by the resolving ability.
No other card is named in this ruling.
#2January 19, 2018· Wizards of the Coast
When Silverclad Ferocidons's triggered ability resolves, first the player whose turn it is (if that player is an opponent) chooses which permanent they will sacrifice, then each other opponent in turn order does the same, then all chosen permanents are sacrificed at the same time. Players will know choices made by earlier players when making their choices.
No other card is named in this ruling.
#3January 19, 2018· Wizards of the Coast
If creatures an opponent controls are dealt lethal damage at the same time that Silverclad Ferocidons is dealt damage, those creatures will be destroyed before that player chooses a permanent to sacrifice.
No other card is named in this ruling.
#4January 19, 2018· Wizards of the Coast
If multiple sources deal damage to a creature with an enrage ability at the same time, most likely because multiple creatures blocked that creature, the enrage ability triggers only once.
No other card is named in this ruling.