Feldon of the Third Path

Before I begin I'll just state that I will not be explaining the mechanics of the game, I'll just be gushing about certain cards and combos that can be created

Now with that short disclaimed can I just say this this card is absolutely beautifal? This is probably my favourite card in the entire game at the moment, mainly because of the amount of fun I had playing a commander deck centered around it. If your looking for a commander that loves graveyard recursion, please find someone else as this one is taken!

High Damage High Value

What you see here is an infinate combo that will not only get you infinite life, but infinite damage as well. this is ow it works

This combo is actally pretty simple.
First you play Bolas's Citadel, which allows you to play cards from the top of your library for the cards converted mana cost (for example, the coverted mana cost of Bolas's Citadel is 6).
Then with you play 'Sensei's Diviing Top' which is a card that you can tap to put on the top of your library, drawing a card as it does so. With these two alone you can make 1 life equal one card.
But the finisher is Aetherflux Reservoir, which gains you to gain 1 life for every spell you cast, whenever you cast a spell. It also allows you to pay 50 life to deal 50 damage. Considering the starting life total is 40 in most commander games You'll be able to kill a couple of players with this combo, with enough value to continue dominating if you don't win outright.