Ple-Sen
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I would give Erika something like "Cost 8, 4/4, commander, fanfare: give a friendly officer an extra turn. At the beginning of your turn, give a random friendly officer an extra turn." Maybe with different numbers for OD and stats.
Added 3 minutes later
And Isabel can be given the ability to spellboost cards in her hand for each opponent (or ally) on the battlefield.