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Keep an eye out for the keyword paradox that appreciates you casting cards from zones other than your hand, such as with suspend

If you can trigger Tax Collector's enter the battlefield effect multiple times with a card like Essence Flux or Ephemerate, you can essentially make it near impossible for the opponent to cast a spell on their next turn

Maybe as an enabler for Rakdos, Lord of Riots, like a worse Lobber Crew

Adventures in the Forgotten Realms, Strixhaven: School of Mages, and Theros Beyond Death all have good haste cards

Finally, Waterbending is an additional colourless cost to a Spell or Ability for Waterbenders that can be paid in regular Mana OR by tapping a controlled artifact or creature to pay one cost towards the total