I really like the deck idea and also your deck building rule! Sadly I don't see a way of hasting your creatures without red, but maybe I can help with throwing some card ideas at your direction
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Baneful Omen 0,50€ KILL FASTER
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Blood Tithe 0,05€ LIFEGAIN
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Bubbling Cauldron 0,05€ LIFEGAIN
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Bontu's Monument 1,20€ LIFEGAIN
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Court of Ambition 1€ KILL FASTER
There are more enchantments with *opponent loses 1 life, you gain 1 life*, I don't know if this would be enough to survive a little longer.
This seems to me like the perfect villain deck, where everybody gangs up against you! It's fun to be the bad guy