Economical counters
Akan, Anubis, Neysa. This works for many with a bit of luck

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note-still works, but a lot less good now that boneyards make immortal skeletons
eventually get 1 black nymph to put vampirism on antidragons to win

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steal sov, rock voodoo & scorpions

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could probably be tuned to be more loki-specific, feel free to swap some precogs for innos depending on collection, don't use sobr though (loki has sanc)

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givesingu (https://etg.dek.im/forum/index.php?topic=1282)/guilesingu (https://etg.dek.im/forum/index.php?topic=761) have a shot, replace quints with freeze

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The steal/midas counter in first post is relatively cheap
antimatter eternity to trick AI into leaving it alone

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Throw in Druidic Staff if available

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dragon, regrade, mitosis, sor, pu, pu, pu, blitz

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only play diss/magma with PA, deckout with voodoo/magma/rock

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get oty out fast, try to get shaman down before first tidal, momentum oty if necessary vs ice shield or buff first boar, devour shamans once stabilized

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regrade dims to reset counter

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Regrade magma to outheal elves, can regrade dials on field for draw, can substitute lobo with 6 thunderstorm

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replace heals with shard of gratitude or upped shaman if possible

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any arctic squid or sopa help to move towards best counter, freeze squid to get arctic squid

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If you can afford upgrades, convert Phase Shields to Diamond Shields, change pends to pillars, & set mark to :earth
be careful about bond upkeep

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kirby brainstormed some ideas, leave a post about how the decks work out if you try them (https://etg.dek.im/forum/index.php?topic=12.msg5283#msg5283)

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Tweaking needed, etc
EDITS:
More Bubble, Phantoms screw with you a lot

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Dragons strain less on quanta, maybe

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Note: Whatever you do, DO NOT LET CLOAK GET PLAYED. Freeze his squids before yours if you must.
Bernoulli probably would just be an unupped version of the Bonestorm. SoFo decks are not economical, the Deck is unreliable.
Cardinal might be workable with Limitless Speed, which I hope is considered economical, as it has only 3 nonrare upgrades required.
Higgs/Neysa/Nosferatu/Suwako deck images broken; will fix soon, it's almost 2 am here.

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Threw together this deck vs Higgs because i didnt have the right upgrades for the other two decks in op.
(https://i.imgur.com/0ZdX7sY.png)
(https://imgur.com/EltGWYA.png)
Stalled Matrix a few times to ~70 plies with this, luckily AI too stupid too stop buffing spooders in favor of byts or psions when they're available.

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I haven't tested anything yet, but you just need to add damage to kill and it's probably good enough, although if Matrix draws no spooders it's an autoconcede which sucks.
don't really know what to replace with fahrenheit sorry

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There's probably a better wings stall (a rainbow maybe?) out there but this sort of works for now.
EDIT: It works like half the time which is probably insane for an unupped, 1 rare deck. Matrix is such a pain
EDIT2: For a true econ a modified version of this vanilla Morte counter (http://elementscommunity.org/wiki/Morte) might work actually

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cardinal counter, i have tested it in "custom" and i have no idea if it is intended for ai to start getting lazy and not using abilities and not playing many cards except chargers and sofo after i play broken mirrors
start chaining dims before u are under 60hp, tbolt chargers, lobo sofo (or tbolt if u don't have lobo)
don't waste quanta on phantoms at the beginning, remember always the shuffle from discord if u didn't start chaining so u risk to get locked or get too much damages
considering i am unlucky this in my opinion has almost a 70% winrate (i have made 8-2) , most of matches if u play broken mirror first turn can end like this
(https://i.imgur.com/h68tyxH.png)
i have only killed a single charger