My solution to “most damage to opponent’s infinite health base within one turn, given a fully cooperative opponent, unlimited setup, and no ability to deal infinite damage” follows:
We are Truth, Finesse, Present. Our opponent is Finesse, Discipline, Future.
We are going to maximize first the number of Grounded Guides we control, second the number of Star-Crossed Starlets we control, and third the total number of units we control, and then attack with everything.
The steps are as follows:
Play Everything
Both players can destroy their first Tech Lab and build a new one, allowing all units in both Codices to be played. Also, there are plenty of spells to worker, allowing you to get up to 20 workers, and just never worry about money.
Steal Everything
One by one, Mind Control all of your opponent’s (targetable) units, then use Geiger’s max-band to trash it and return it to play permanently under your control. Attack Geiger into the opponent’s Tech III things that you can’t steal to re-set him each time.
[details=Make Everything a Mirror]With a sufficiently tiny deck, you can play Manufactured Truth, reshuffle and draw it (with, for example, Research and Development or even Geiger’s Mid-band) and play it again.
With the sequence:
Manufactured Truth turns XXX into a Mirror
Quince turns XXX (Mirror) into a Mirror
Manufactured Truth turns XXX (Mirror) (Mirror) into a Gilded Glaxx
At end of turn, Quince attempts to trash XXX, but cannot due to floating gold this event only happens once
Manufactured Truths wear off, leaving XXX as a Mirror indefinitely
XXX can be any Tech 0 or Tech 1 unit. Significantly, it can be the renewable Dancer tokens from Harmony
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[details=Make as many Stingers as possible]Use up 2 mirrors permanently using Quince’s max-band to copy the two Hives
Turn all Stingers into Mirrors, per previous point.
Then, copy a Hive onto a Mirror using Quince’s mid-band, make 2 additional stingers, and use Manufactured Truth to make both of them into Gilded Glaxx. When the turn ends and the newest Hive is trashed, you control no Stingers to sacrifice. Later you can make the new stingers into Mirrors.
The (limit 5 per hive) does apply to these new mirrors, so you can’t make an infinite number of them, but you can have up to:
2 real Hives
2 max-band Hives
2 mirror-from-quince Hives
3 Dancer (Mirror) Hives - none of which cut into your reserve of mirror tokens.
In addition, you can use up 1 stinger (mirror) each cycle while still increasing the total number of stingers.
That means you can have 10 Hives in play, meaning you can have 50 stinger (mirror) tokens
Edit: you can also have two stolen dancers as replaceable hives, so we’re up to 60 stingers. This uses up all 20 gold, and requires using Geiger midband to re-draw MT.
Minus 1 stinger/mirror/Hive that gets trashed eot.
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[details=Turn everything into Star Crossed Starlet]With each mirror, use Quince to make it a Star-Crossed Starlet, then use Manufactured Truth to make it a Gilded Glaxx until end of turn so it survives Quince’s trash effect.
Use the stolen Helpful Turtle to keep the Starlets alive until the lead-up to the final turn
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[details=Lead-up]When everything else is complete, flicker the 4 Grounded Guides, making a permanent copy of them with Quince’s max-band.
Use a stolen Sparring Partner to put a +1/+1 rune on everything.
Play Dreamscape, so everything gets the Macciatus bonus
Convert the Helpful Turtle and Gilded Glaxx that have been saved into Mirrors (first copy the Glaxx onto a quince token)
Let all the Starlets accumulate as much damage as possible (2 hp + Macciatus + rune + 8 hp from Guides allows for 11 damage) edit: four of them can have 2 extra damage thanks to Two-Step
Steal 2 of the opponent’s Dancers with Mind Control (can’t blink them and keep them, so no infinite)
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[details=Final Turn]In play you have:
59 stingers + 7 stolen tech 0 + 6 blue tech 0 + 24 tech 1 units + 5 dancers + 2 “real” mirrors = 103 mirrors
2 have been permanently turned into Hives
4 have been permanently turned into Grounded Guides
Make 10 more into Grounded Guides with Quince’s mid-band
The remaining 87 mirrors are all Star Crossed Starlets
Simply attack with everything, dealing:
Star Crossed Starlets - 87 * 52 ATK (3 + 2 + 182 + 11)
Grounded Guides - 18 * 23 ATK (4 + 2 + 17)
Macciatus - 1 * 23 ATK
Blademaster - 2 * 45 ATK (7 + 2 + 182)
Hives, Reaver, Chronofixer - 8 * 20 ATK
WGD - 2 * 21 ATK
Maestro, Backstabber, Cloud Sprite, Leaping Lizard, Reteller, YLD, Xenostalker - 22 * 23 ATK
Spectral Roc, Focus Master, Hyperion - 6 * 24 ATK
Spectral Tiger, Liberty Gryphon, Immortal, Void Star - 8 * 25 ATK
Vigor Adept - 2 * 26 ATK
Octavious - 2 * 28 ATK
Tricycloid - 2 * 29 ATK (counting the 3 pings after attack)
Use a Quince attack to kill an opposing hero and max Geiger, flickering a Nimble Fencer and attack with the Fencer for an extra (2 + 1 + 18 *2) = 39 ATK
Geiger (3), River (3), 2x Two Step (8), and the 8 extra damage on Starlets the Two Steps allows comes to a bonus 22 damage.
Total of 6330 damage, 4524 of that from the Starlets alone.
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Final result: 6330 damage