Profet93 here is my mainstay in terms of me as my core as a player

Just cut the cute s**t Elven Warhounds for another great addition to the deck Saryth, the Viper's Fang

Just getting back to you about Omen of Fire, I've tried to slip it into a few decks, and the biggest complaint I had was that the decks I wanted to use it in were low enough in power level that people would sometimes balk if they were hit too hard by the land hate aspect. I think if you're allowed to use Game Changers (Bracket 3) you shouldn't get too much negative attention for Omen (expect some though). It's also a meta call, if nobody uses White or Islands then the card can do absolutely nothing. The Instant speed nature of it can matter in some lists, if you play it on a Blue player's end step then they can't replay any of the Islands that turn (and might have to discard a bunch), whereas a White player might have to choose between losing their blockers for the turn or sacrificing their aggro creatures, especially if they don't have a lot of Plains. FWIW a LOT of 'go wide' type token decks use White tokens, this will wipe out those tokens.

Omen plays well with cards that help your interaction get through, like Vexing Shusher for example, because you might find that the decks you most want to hit with it are best suited to just counter the spell.

Omen gets a lot worse if you're playing against people who use untyped duals, but I will note that more and more people like using things like the Surveil lands and Triomes, meaning even if people aren't on OG Dual Lands they can still have access to plenty of playable typed duals, and FWIW Omen is MUCH better vs ETB tapped Islands. If you find people react to you running Omen by running more of these untyped duals you can start using Primal Order that punish people for using non-Basics (I feel like you could probably get away with running a lot of Basic lands in a Gruul list, ymmv), so people are hurt either way.

Hopefully that can help give you insight into running Omen in a deck of your own!

I'm not sure if it's really an issue in your metas, but I found that when I built infinite combos it was often a big asset if I had some different types of payoff; this could help me get around protection effects in some cases. Anyways, Altar of the Brood allows infinite creature ETBs to mill out each opponent, all without targeting, and they die when they draw their next card. If nobody ever has Protection or some from of damage immunity then this isn't relevant and sorry for wasting your time!

I have a fancy Inkmoth Nexus that does essentially nothing ATM, but your idea of using it with Kessig Wolf Run seems reasonable, I think I might add it to my own Gruul list, it even wants some Colourless lands. Thanks!

DreadKhan

Phenomenal insight into Altar of the Brood totally overlooked that! As soon as I can stop by my LGS to pick up the copy I literally just traded in for credit, it will find its way back into the deck like it originally was.

As for Omen of Fire, I’m playing this deck in the cEDH community. The more I look at this card the more I do still want to play it but as we both I’m sure agree it is in fact very meta, but the only real thing holding me truly back at this point is that I’m running Dryad of the Ilysian Grove. Although it’s only a single copy I can’t risk bouncing my own lands. Looking back at Tectonic Break now and maybe even potentially Epicenter

DreadKhan - updated list with your suggestion added, appreciate your insight again.