The main goal of Torgaar's Rite is to be able to cast Torgaar, Famine Incarnate and Hidetsugu's Second Rite in the same turn, since if we put our opponent to 10 with Torgaar and then pass, something like an untapped shock land will undo all of our hard work
Professor's Letter Energy for attacks is vital for every player
Mithril Coat will likely become widespread in the Commander format once Tales of Middle-earth releases, and it may appear alongside or in place of Swiftfoot Boots and Lightning Greaves
There are new dual lands, as well, and these ones seem pretty powerful, entering untapped and tapping for colored mana as long as they just entered or you have at least one basic land
The Madrigal Family comes out in full force here and their abilities work really well together
In most of those older cards, the text might read something like: Whenever this creature would be destroyed, instead tap it, remove all damage from it, and remove it from combat. Thats basically the reminder text for how regeneration works