Wizards has defended the incomplete reminder text by pointing out that it's not the first keyword that you have to read the rules to fully understand, and that casual players will assume it works because they assume everything works, while experienced players are all tapped into the data stream and will have heard the clarification before the Prerelease
PrintMTGs proxy/playtest cards are designed around that in-sleeve consistency idea: standard MTG sizing, familiar feel, and predictable finishing so your deck doesnt end up with one card that behaves like its trying to get caught
Break through The Line seems unplayable, so don't try to be cute and make it playable
It makes creatures, although its expensive, and it can transform into a powerful beater that can end games for a relatively paltry cost
Urza, Lord High Artificer Urza, Lord High Artificer is one of the best Magic cards in any list it qualifies for, from best blue commanders to best artifact commanders