All 7 Combos with Drannith Magistrate

Drannith Magistrate + Knowledge Pool

Lock: Opponents can't cast spells, Lock

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.

Cards: Drannith Magistrate, Knowledge Pool

Uba Mask + Drannith Magistrate

Lock: Players can't draw cards, Lock, Opponents can only cast the remaining spells in their hand