There will be NEW cards added to Alchemy, and some cards that are in Standard will be rebalanced for Alchemy, but stay the same in Standard
Certainly there are lots of legends in the cube and that is part of why this list looks so conventional
These include cards such as Avatar Aang (flying, firebending, transform), Aang, at the Crossroads (Ally fetch, transform), Boiling Rock Rioter (firebending, Ally reanimate), Earth King's Lieutenant (+1/+1 counters), Fire Lord Zuko (firebending, +1/+1 counters), General Tazri (Ally fetch, anthem effect), Hakoda (cast Allies out of your deck, protection), Katara, the Fearless (double triggers), Katara, Water Tribe (vigilance, 1/1 counters, waterbend), Sokka (menace, prowess, 1/1 tokens), and many more
Come crashing out of the gates, blazing into combat with Prossh, Skyraider of KherProssh, Skyraider of Kher eating all his minions before getting BerserkBerserk'd, leaving nothing but a pair of smoking boots left as a memory of your opponent
There is a ten-card cycle of two-color cards at uncommon