Whenever a player casts a spell from their hand, Knowledge Pool triggers, exiling the spell and allowing the player to cast another card exiled by Knowledge Pool without paying its mana cost.
Drannith Magistrate prevents opponent from casting anywhere other than their hands.

Opponents can't cast spells

Lock

Drannith Magistrate

Knowledge Pool

Whenever a player would draw a card, Uba Mask exiles that card and allows the player to play that card from exile this turn.
Drannith Magistrate prevents opponents from playing nonland cards exiled by Uba Mask.

Players can't draw cards

Opponents can only cast the remaining spells in their hand

Uba Mask

Omen Machine prevents players from putting more cards in their hand and Drannith Magistrate prevents players from casting the cards otherwise.

Omen Machine

When an opponent casts a card from their hand, Possibility Storm will exile it.
They can not cast any cards from Possibility Storm because the exiled cards are not cast from their hand.

Possibility Storm

During each opponent's upkeep, Urabrask's second ability triggers, causing them to exile the top card of their library the next time they would draw a card this turn.
During the opponent's draw step, they exile the top card of their library.
Due to Drannith Magistrate, the opponent is unable to cast the card exiled by Urabrask.

Opponents skip their draw steps

Urabrask, Heretic Praetor

Whenever a player casts an instant or sorcery spell, Eye of the Storm triggers, exiling that spell and allowing the player to copy each spell exiled by Eye of the Storm and cast them from exile.
Because Drannith Magistrate prevents opponent from playing spells from anywhere but their hands, they cannot cast the copies made by Eye of the Storm.

Exile all instants and sorceries opponents cast

Opponents can't cast copies made by Eye of the Storm

Eye of the Storm

If a player would draw a card, that player exiles the top card of one of their opponent' libraries face down instead.
opponent can not cast any cards exiled by Shared Fate because Drannith Magistrate prevents them from casting cards form anywhere other than their hands.

Combos with "Drannith Magistrate"