As I mentioned before, life is a resource, and as such, the ability to have untapped, fetchable mana fixing is monumental
The special section will touch on interactions that did not make it into the other sections, possible alternatives (Might not be present for all cards), and any differentiated application for multiplayer if any
Thousand-Year Elixir lets you tap creatures to use their abilities even when they have summoning sickness as if they have haste
Enduring Tenacity is the best of the bunch, as its a mana cheaper than Sanguine Bond, an EDH staple
This can make it have some less efficient cards and plays, but they do work together, as you will want to be putting cards into the graveyard to put them into play again
Originally featured on Taoist Hermit and Zuo Ci, the Mocking Sage, hexproof was pretty rare until it was formally keyworded in Magic 2012