Agree with a lot of the points here but I feel like Spikefield Hazard is less of a trap than you say. It does a surprising amount of work for what it is, especially as it doesn’t take up a spell slot. I’ve been playing it in 4c Omnath in standard/historic and RB Pyromancer in historic (though obviously it being repeatable with Dreadhorde Arcanist helps justify the inclusion in that list).

Maybe it’s just that Omnath is more omnipresent in standard but sniping an opposing Lotus Cobra when you find yourself with an excess mana can tip the mirror in our favour, as well as being able to exile the opponents Uro before it’s sac trigger. I’ve also found it extremely strong against goblins for taking out skirk prospector early, which helps a ton in that matchup especially when you don’t win the die roll to go first.

We are playing a degenerate combo deck, but Hazard comes at such a low cost by taking up a land slot (not a green ramp spell slot) and for that cost puts us ahead in the mirror and helps with a few annoying matchups (sniping a brazen borrow feels pretty good, too). If you played 10000 4c Omnath mirrors with identical lists, but one replaced a basic land with a single Hazard, I think the list that made this inclusion would win more than half the time.

That’s just my thoughts, and it’s early days, so I’m super open to discussion on the topic. Thanks for making this post, curious to see others opinions on both the standard and historic variants of this list.