As the colours are quite similar the most powerful cards tend to be versions of things that the mono colours basically do but just that bit cheaper or better
Lurrus does come with a deck building requirement, which disallows playing permanents with a mana value above two
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Against control, you might bring in Ozai's Cruelty or Roiling Vortex to prevent lifegain and punish free spells
It can be a little slow due to needing Equipment and Auras already in play for Halvars triggered ability to work, but its worth it since it triggers on every combat
The strategy is one of controlled chaos