Jetmir, Nexus of Revels

Mana cost: {1}{R}{G}{W}
Type: Legendary Creature — Cat Demon
Power / toughness: 5 / 4
Set: The List #SNC-193 (mythic)

Creatures you control get +1/+0 and have vigilance as long as you control three or more creatures.
Creatures you control also get +1/+0 and have trample as long as you control six or more creatures.
Creatures you control also get +1/+0 and have double strike as long as you control nine or more creatures.

Jetmir, Nexus of Revels has 8 printings, first in Streets of New Capenna (2022). EDHREC ranks it #2,274 among Commander cards. It appears most in Rin and Seri, Inseparable decks (19,473 on EDHREC). 1 public deck on TCG runs it. It has 1 official ruling.

Legality

commander: legal
legacy: legal
vintage: legal
pauper: not legal
modern: legal
pioneer: legal
standard: not legal
brawl: legal

Public decks that run Jetmir, Nexus of Revels

Raining Cats and Dogs - Secret Lair Drop, led by Rin and Seri, Inseparable

Commanders that run Jetmir, Nexus of Revels most

Deck counts from EDHREC.

Rin and Seri, Inseparable: 19,473 decks
Baylen, the Haymaker: 11,217 decks
Aragorn, the Uniter: 5,028 decks
Hazezon, Shaper of Sand: 4,082 decks
Jinnie Fay, Jetmir's Second: 3,640 decks
Marisi, Breaker of the Coil: 1,189 decks
Ghired, Conclave Exile: 934 decks
Samut, the Driving Force: 913 decks

Often played with Jetmir, Nexus of Revels

Cards that show up in the same decks on EDHREC.

Rulings

2022-04-29: If a creature with double strike loses double strike after dealing damage during the first combat damage step but before dealing damage in the second combat damage step, it will not deal damage during that second combat damage step. Notably, this means that if your ninth creature dies in the first combat damage step, the rest of your creatures won't deal combat damage again unless something else is granting them double strike.