Jeskas Will quickly rose to popularity after being featured on an episode of Game Knights
Saruli Caretaker is one of the best, offering the ability to tap for any color while still providing solid defense
There are also ways in Golgari to buff creatures, so if you increase Jenova's power, you can both buff your other creatures more, and draw even more cards when they die
They do not apply to your sideboard, nor to any cards added to your deck after the game began (such as with the conjure mechanic)
Key cards that pair well : Terror of the Peaks - If you're running a dragon deck, then this Red menace will make short work of your opponents threats or their life totals
Ideally, you want to give this some sort of evasion, and cards like Garruks Uprising help with that