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If you really wanted to reinforce Unions as a whole to compete with the current meta: I would say something like "Target 1 Union monster from your hand, Deck, or Graveyard: Special Summon 1 monster whose name is included in the card text of that card from your Deck or Graveyard

The text on Kaza, Roil Chaser reads: The next instant or sorcery spell you cast this turn costs X less to cast, where X is the number of Wizards you control as this ability resolves. In the same vein as Vadrik, you get the total cost of the spell plus kicker, and then reduce the total cost

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Looking at which themes offer the strongest and most flexible options for support within the Commander card pool, instants and sorceries are the clear winner