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For one red mana at instant speed, your creature gets +2/+0, and a permanent aura which grants a further +1/+1 and Trample, making it combo brilliantly with Valiant, Prowess, and especially both

Wizards, nor many stores, acknowledge this officially and youd have to find a group within the online communities to start getting into it

If Knight of Doves leaves the battlefield while it has an Aura you control attached to it or at the same time as another creature with an Aura you control attached to it, its ability won't trigger for those enchantments unless they were destroyed by the same effect that caused Knight of Doves to leave the battlefield

Is this relevant