Collective Persistance

The main idea of this deck is to combo Cauldron of Souls with Vizier of Remedies / Heartmender.

This combo returns any creature you control that dies to your battlefield, but removes Cauldron's -1/-1 counter.

Heartmender removes Cauldron's -1 counters during your upkeeps, in case you don't have Vizier out yet, or your opponents have managed to get rid of all four copies of it.

Brawn gives all of your creatures Trample while he's in the grave, so he should be the first thing you get rid of whenever possible. Probably by baiting blocks or being a blocker.
Your opponents won't want him in the grave, but they either let all of your creatures get Trample, or risk him getting built up with Shield of the Oversoul and Collective Blessing.

Kitchen Finks and Dawnglow Infusion are used for life gain, as is Dragonlord Dromoka and Elderwood Scion.

Aura Mutation is to rid the field of your opponents troublesome enchantments, while potentially giving you an army of Collective-boosted Tramplers.

This build should allow you to attack or block freely, which would put pressure on your opponents by making them unsure about when to attack or block, since you can do either without worrying about your creatures dying.