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Lurrus of the Dream-Den Weve finally hit the first Companion card of this discussion, andwow

If you have mana-producing myr like Palladium Myr or if Cryptolith Rite is allowing you to tap myr for mana, you can sequence the beginning of your combat step to cast high-cost artifacts

Since these cards are a one-time use, cards that you can keep discarding with are great like Mary Read and Anne Bonny, Merfolk Looter , and Magus of the Bazaar

The Master, Multiplied The Master, Multiplied basically overrides all the downside with mechanics like myriad because you wont need to sacrifice the tokens you get until the end of turn