While playtesters can be contacted, having personal requests from friends of theirs is the only way to ensure accurate information is obtained
Meanwhile, its hard to fight against the life loss by drawing
The ability to grant haste to modified creatures can lead to explosive turns and surprise attacks, while also providing a way to pump up creatures with the +1/+1 counters
Spells with this kind of effect are becoming increasingly problematic in Magic - if seven mana additional turn spells like Nexus of Fate and Alrund's Epiphany can get banned, it's easy to see why Time Walk is so scary
The difference in power between Chained and Journey is minimal compared to the difference in playability and so I just can't justify the vulable cube slot
After all, anything printed before Exodus used a black expansion symbol regardless of rarity, so the symbol color won't help you tell what rarity a card is