Termagant Swarm — ruling 1

If another permanent enters the battlefield as a copy of a creature with Ravenous, it will not enter with any counters from the ravenous ability.

Termagant Swarm — ruling 2

Use Termagent Swarm's power as it last existed on the battlefield to determine the number of tokens you create.

Termagant Swarm — ruling 3

See also "New Keyword Ability: Ravenous" in General Notes.

Termagant Swarm — ruling 4

A creature with ravenous gets its counters as it enters the battlefield. It doesn't enter the battlefield first and then get its counters. Any triggered ability that looks for a creature with a certain power or toughness entering the battlefield will see the counters when it checks to see if it should trigger.

Termagant Swarm — ruling 5

The triggered ability that checks to see if X is 5 or greater refers to the value of X that was chosen as the spell was cast, which may be different from the number of counters it entered with if there are replacement effects involved. This is also true for any other ability that it has which refers to X and triggers when it enters the battlefield.

Termagant Swarm — ruling 6

If a permanent spell with ravenous is copied, the copy will have the same value for X, and the token permanent that the spell becomes as it enters the battlefield will enter with X counters.

Termagant Swarm : règles, fonctionnement et interactions (MTG)

Termagant Swarm 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

Ravenous (This creature enters with X +1/+1 counters on it. If X is 5 or more, draw a card when it enters.) Death Frenzy — When this creature dies, create a number of 1/1 green Tyranid creature tokens equal to this creature's power.

How it works : Termagant Swarm

Original English text — Wizards of the Coast / Scryfall

#1October 7, 2022· Wizards of the Coast
If another permanent enters the battlefield as a copy of a creature with Ravenous, it will not enter with any counters from the ravenous ability.
No other card is named in this ruling.
#2October 7, 2022· Wizards of the Coast
Use Termagent Swarm's power as it last existed on the battlefield to determine the number of tokens you create.
No other card is named in this ruling.
#3October 7, 2022· Wizards of the Coast
See also "New Keyword Ability: Ravenous" in General Notes.
No other card is named in this ruling.
#4October 7, 2022· Wizards of the Coast
A creature with ravenous gets its counters as it enters the battlefield. It doesn't enter the battlefield first and then get its counters. Any triggered ability that looks for a creature with a certain power or toughness entering the battlefield will see the counters when it checks to see if it should trigger.
No other card is named in this ruling.
#5October 7, 2022· Wizards of the Coast
The triggered ability that checks to see if X is 5 or greater refers to the value of X that was chosen as the spell was cast, which may be different from the number of counters it entered with if there are replacement effects involved. This is also true for any other ability that it has which refers to X and triggers when it enters the battlefield.
No other card is named in this ruling.
#6October 7, 2022· Wizards of the Coast
If a permanent spell with ravenous is copied, the copy will have the same value for X, and the token permanent that the spell becomes as it enters the battlefield will enter with X counters.
No other card is named in this ruling.