The equivalent to flashback for permanent cards is called unearth
It is another excellent sacrifice outlet, albeit a one-time use, most of the time
Green has strong cards like Tyvar's Stand from MTG 's most recent set, Phyrexia: All Will Be One and Gaea's Gift, while blue has Shore Up and Cradle of Safety which provide Hexproof and additional effects
Having reliable access to a 12/12 in the command zone opens up so much fun design space to brew around, letting us draw silly amounts of cards, ramp crazy amounts of lands, wipe out opposing boards of creatures, and obviously (over)kill our opponents in glorious dino dominance
There are already a solid amount of existing rebel cards in Magic that you can run with Leia
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