Transforming doesn't give a permanent "summoning sickness," so if a creature has been under your control continuously since the beginning of your turn, it can still attack even if it transformsassuming it transforms into a creature
Magic: The Gathering began to cater to collectors of the beloved card game more starting in the late 2000s by debuting the From the Vault series, which featured limited-release collections of notable cards from Magics history
According to the sets official release notes from Wizards of the Coast, the battles serve as a thematic tie-in to the overarching story behind March of the Machine, where the cultist army of Phyrexians have launched their invasion of the entire multiverse
While the cards constructed viability is questionable, it does seem like an interesting finisher in Commander
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Midrange strategies can play Lumra as a potent six mana threat that incidentally provides them with plenty more lands to help fuel their one-for-one trades and slowly accrued advantages, creating a situation where creature lands might be the only real win condition they need if Lumra gets answered