Suitable drafting rules for multi-set repacks?
Drafting with multi packs or with packs from all different blocks works just fine you just need to aim for certain archtypes (control, aggro, ect) as opposed to specific strategies (such as human tribal) and you'll have more success. In my experience the only rule you really need to have outside of regular draft rules is to ban the unsets. Sealed also works well. Same advice (archtype over specific strategy) applies though you have a bit more leeway since you can see everything you have from the get go.