Omen Machine prevents the active player from drawing a card, and causes them to exile the top card of their library, and cast that card if its a spell without paying its mana cost, or put it onto the battlefield if it's a land.
If a player casts a spell this way,
Vexing Bauble triggers, countering that spell.
Results
Players can't draw cards.
Players can't cast noncreature spells exiled by
Omen Machine.
Metadata
Lock
Locks your opponents out of taking some actions.
Bracket tag
SpicyBracket 3-4+
Probably 3 or 4, but hard to classify
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1 · Exhibition5 · cEDH
Bracket tags are estimated from the cards and results of each combo, as a guideline rather than a strict classification.