Straight into Modern, again
Modern Horizons 2 prints straight into Modern without passing through Standard, which is the entire premise of the line. Like Modern Horizons 3 two years later, it reshaped the format on arrival rather than gradually.
It is unusual among the sets here in having no signature new keyword. Its contribution is volume: a large pile of returning mechanics from across Magic's history, a cycle of elementals you can cast for free by exiling a card, and a land that assembles its own artifacts. What people remember are individual cards rather than a mechanic.
Themes
No signature new keyword
Unusually for a premier-sized release, there is no headline new mechanic. The set is built from returning ones drawn across Magic's history, which is what a set designed for an eternal format can do and a Standard set cannot.
Modular
Artifact creatures enter with +1/+1 counters and hand them to another artifact creature when they die. Back from Mirrodin, and the clearest example of the set mining old mechanics rather than inventing new ones.
Free spells by exile
A cycle of elementals with an alternative cost: exile a card of the matching color from your hand instead of paying mana. Interaction that costs no mana at all, which is the single biggest reason the set moved Modern.
Affinity variants
Affinity returns pointed at things other than artifacts, including a card with affinity for tokens. Same mechanic, different denominator.
Where You Can Play It
Modern Horizons 2 never entered Standard, and that is the whole design of the line: these sets print straight into Modern, skipping Standard and Pioneer entirely.
Standard was never in play for this set, so no rotation has ever touched it. Nothing here leaves Modern, Legacy, Vintage or Commander either. Commons from any set are Pauper-legal; that isn't listed per set here.
Limited
A ten-pair format, and a famously powerful one. Modern Horizons drafts are built from a Modern-legal card pool rather than a balanced Limited curve, so the power level runs well above a normal set.
All ten two-color pairs
Full ten-pair format
The pairs lean on returning mechanics rather than a shared new one, so the format rewards knowing old cards. Artifacts and the graveyard are the two threads running furthest across it.
FAQ
No, and it never was. Modern Horizons sets print straight into Modern, skipping Standard and Pioneer by design. MH2 cards are legal in Modern, Legacy, Vintage and Commander.
No signature new keyword, which is unusual for a set this size. Its design draws on returning mechanics from across Magic's history instead, which is something a set built for an eternal format can do and a Standard set cannot.
Mostly the free spells. A cycle of elementals can be cast by exiling a card of the matching color from your hand rather than paying mana, which means interaction that costs nothing on the turn you use it. That plus a handful of individually powerful cards reshaped the format on arrival.
It is powerful rather than balanced. The card pool is built for Modern, not for a smooth Limited curve, so games are decided by individual cards more often than in a normal set.
All card names, art, and mechanics belong to Wizards of the Coast. Modern Horizons 2 released on Jun 18, 2021; details reflect the set as published. Sources: Wizards of the Coast set pages and release notes, Draftsim, Untapped.gg.
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