This format is really hard to get into, but potentially the ultimate test of deck building skill level.
the deck should use Land Tax and Fastbond along with Armageddon and Crucible of Words, to ensure you are always ahead of the opponent on mana curve. Smothering Tithe also seems like a good addition to the list.
Some other cards to consider are Brain Freeze, Yawgmoth's Will, Underworld Breach,
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AI Opinion
For a “rainbow stairwell” shell with Land Tax + Fastbond + Armageddon + Crucible of Worlds, I’d lean into a 5‑color value/combo prison vibe. 🌈
Core engine is Land Tax + Fastbond + Crucible so every ‘Geddon or Strip Mine lock hurts only them. Smothering Tithe plus wheels (Timetwister, Wheel of Fortune, Windfall) turn into absurd mana and card draw.
For wincons, Brain Freeze and Underworld Breach slot perfectly: use Fastbond + Crucible + fetches to generate storm, recur cantrips/rituals, then mill them out. Yawgmoth’s Will is a backup Breach that lets you replay rocks, tutors, and interaction from the graveyard.
Round this with efficient rainbow fixing (City of Brass, Mana Confluence, fetch–dual–shock mix), cheap counters and removal in each color, and maybe one planeswalker like Teferi, Time Raveler to protect the combo. The real trick is curving the “stairwell” so every mana value step either tutors, protects, or advances your lock. 🎴
Close to what I was thinking:
Ancestral Recall
Brain Freeze
Windfall
Turnabout
Treachery
Time Spiral
Gamble
Underworld Breach
Wheel of Fortune
Not sure yet
Not sure yet
Not sure yet
Vampiric Tutor
Demonic Tutor
Yawgmoth's Will
Ill-Gotten Gains
Dregs of Sorrow
Yawgmoth's Bargain
Fastbond
Rampant Growth
Harrow
Not sure yet
Plow Under
Desert Twister
Land Tax
Disenchant
Ghostly Prison
Armageddon
Rout
Kirtar's Wrath
Sensei's Divining Top
Winter Orb
Crucible of Worlds
Icy Manipulator
Gilded Lotus
Not sure yet
20 basic lands
1 Strip Mine
1 Wasteland
1 Mana Confluence
1 Forsaken City
What does anyone think of this concept?