If your opponent takes out Avacyn, they've got one turn at least to deal with the Shepherd before it brings her right back in a frightful bit of synergy
The five colors are white, blue, black, red, and green
Most decks run both if theyre aiming for that win condition, but Exsanguinate is positioned much better in the current metagame, where gaining life can often grant you another whole turn that you wouldnt have otherwise had access to
It can copy spells, draw/discard cards, and it can deal lots of damage thanks to prowess
When paired with black staples like Bolas Citadel, Rowan can create huge gains in an instant
If you do sleeve this up, it's worth noting that Kiki-Jiki works with the Port Razer combo mentioned above, which gives you some redundancy with your wincons