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Cosmog can be obtained from Celestial Guardians: Lunala pack in the Celestial Guardians set

Baleful Strix: Great reprint

The fact that her ability targets helps out with all the Valiant effects in Boros Mice, too

When an effect of a monster your opponent controls is activated that targets 1 Cyberse monster you control (and no other cards) (Quick Effect): You can negate the effects of both that Cyberse monster you control and that opponent's monster until the end of this turn

Silverquill Influence (WB): Control the table by manipulating combat and encouraging opponents to attack elsewhere while you generate value and draw cards

Though considering the limits of opening packs daily, especially for free-to-play players, this can take quite a while