Hi again,
You can take a look to this :
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Ranger's Guile very good to extense the durable life of your Commander onto the battlefield, and allow to escape some anti-creature and effect of spells (In blue,red and black opposing forces also)
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Leyline of LifeForce is needed, against blue even, counter blue counterspells
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Adventurous impulse : allow to check and search your own hydras, filter mana and spells instead
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Gaea's blessing (in Maybe Board) to counter black discard...
Thanks you for your answer...
Regards,
Tony