Rienne, the Value Engine (EDH / Commander)

Rienne the value generating angel. This deck is based around awesome creatures that Rienne, Angel of Rebirth forces to keep around.

Rienne's ability greatly increases the usefulness of cards such as Brion Stoutarm, Dauntless Escort, Elvish Hexhunter, Saffi Eriksdotter, and other. It also makes enchanments and artifacts like Greater Good that much better. These are the High Synergy cards.

The one downside to Rienne, Angel of Rebirth, is that the creatures return to your hand. So if we're casting a bunch of creatures, we need a lot of ramp. There are multicoloured creature ramp, and I tried to include those. Cards such as Atzocan Seer, Knotvine Mystic, and Radha, Heir to Keld.

The most important part of this entire deck though, the cog that makes the entire clock tick, is Sneak Attack. Sneak Attack is a broken card that (with Rienne out) allows us to flash in any creature for R and have it safely return to our hand on the end step. If we need it on an opponents turn, flash it in again.
This gets even more broken with creatures like Godsire. Flash it in, attack (if safe), make a token. Rinse and repeat on everyone's turn.
Sadly, there isn't a bunch of tutors in our colours, but it is an enchantment. That means Enlightened Tutor, Idyllic Tutor and Sterling Grove are options. Left out Gamble, Enduring Ideal, and Plea for Guidance, simply because of their cost. May decide to slot these in later.

There are also a number of sac outlets, like Goblin Bombardment, that ironically, are used to protect creatures. If anyone is going to exile or somehow manage to remove a creature, you can sacrifice it in response to return it safely to your hand. Or if you (hopefully) have Sneak Attack out, Goblin Bombardment becomes a "R: Deal 1 damage to any target" ability.

There is also a lot of protection in here, to protect both Rienne, Angel of Rebirth, and Sneak Attack. Heroic Intervention, Pyroblast, Rebuff the Wicked, Red Elemental Blast, Wild Ricochet, Privileged Position, Sterling Grove (although, this is also a tutor), Vigilant Martyr are all forms of protection. Change according to your playgroup meta. For example, replacing counterspells with Lightning Greaves may be a better bet for you.