Mirri, Weatherlight Captain and Judoon Enforcers prevent creatures from entering attacking.

[Tharkon]

When defending player controls [[Judoon Enforcers]] or a tapped [[Mirri, Weatherlight Duelist]] attacking creatures with mobilize (such as [[Dragonback Lancer]] or effects like that of [[War Effort]] will create tokens but they will not enter attacking and a Game Message will pop up saying "No more than one creatures can attack {playername}"

[github-actions[bot]]

Judoon Enforcers - (Gatherer) (Scryfall) (EDHREC)

{5}{R}{W} Creature — Alien Rhino Soldier 8/8 Trample No more than one creature can attack you each combat. Suspend 6—{1}{R}{W} (Rather than cast this card from your hand, you may pay {1}{R}{W} and exile it with six time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may cast it without paying its mana cost. It has haste.)

Mirri, Weatherlight Duelist - (Gatherer) (Scryfall) (EDHREC)

{1}{G}{W} Legendary Creature — Cat Warrior 3/2 First strike Whenever Mirri attacks, each opponent can't block with more than one creature this combat. As long as Mirri is tapped, no more than one creature can attack you each combat.

Dragonback Lancer - (Gatherer) (Scryfall) (EDHREC)

{3}{W} Creature — Human Soldier 3/3 Flying Mobilize 1 (Whenever this creature attacks, create a tapped and attacking 1/1 red Warrior creature token. Sacrifice it at the beginning of the next end step.)

War Effort - (Gatherer) (Scryfall) (EDHREC)

{3}{R} Enchantment Creatures you control get +1/+0. Whenever you attack, create a 1/1 red Warrior creature token that's tapped and attacking. Sacrifice it at the beginning of the next end step.