All of these monsters...

No longer have effect priority:
Ally of Justice Decisive Armor
Ancient Fairy Dragon
Armory Arm
Blackwing - Gale the Whirlwind
Blackwing - Sirocco the Dawn
Brionac, Dragon of the Ice Barrier
Card Trooper
Chaos Sorcerer
Dark Armed Dragon
Dark End Dragon
Dark Grepher
Demise, King of Armageddon
Dimensional Alchemist
Dragunity Knight - Gae Dearg
Elemental Hero Prisma
Gravekeeper's Descendant
Gungnir, Dragon of the Ice Barrier
Hand of the Six Samurai
Hundred-Eyes Dragon
Infernity Mirage
Infernity Doom Dragon
Judgment Dragon
Junk Archer
Karakuri Shogun mdl 00 Burei
Legendary Six Samurai - Mizuho
Lonefire Blossom
Lumina, Lightsworn Summoner
Lyla, Lightsworn Sorceress
Master Hyperion
Mind Master
Red-Eyes Darkness Metal Dragon
Scrap Golem
Scrap Dragon
Scrap Twin Dragon
Superancient Deepsea King Coelacanth
Test Tiger
Worm King
Worm Queen
Worm Zero
XX-Saber Faultroll
XX-Saber Gottoms

So new ruling change more or less sets all of these guys and others at the speed of normal spells.

This of course means your opponent can respond to them before you can trigger their effects.

Naturally Stardust, Monarchs, Gadgets, and I believe Blizzard The Far North still can use their effects.

Yes, though new OCG ruling meant to balance the game. Gone are the days of the priority field nuke. No idea if TCG will get it. We should with the new structure.

Overall I like this, helps explain some of the banlist choices. BOM would of been super sexy.