mtg 2016 commander decks 15 new Magic cards can be found in each deck and a total of 56 new cards in the whole set Blue Red Storm Commander Deck

Biomass Mutation Biomass Mutation can be a powerful finisher for token decks or other strategies going wide

Reanimation cards return cards from the graveyard to the battlefield

Accumulate Wisdom Benevolent River Spirit Boomerang Basics Crashing Wave Ember Island Production First-Time Flyer Flexible Waterbender Forecasting Fortune Teller Geyser Leaper Giant Koi Gran-Gran Honest Work Iguana Parrot Invasion Submersible It'll Quench Ya

Very hard to choose one as there is plenty of good work done every year, but I will go with the full art Grief by Campbell White

On the other hand, their weakness stems mostly from a lack of permanent removal once a threats actually on the board

(Scryfall note) Once Summon: Primal Odin deals combat damage to a player and the ability granted by Summon: Primal Odin's second chapter ability triggers, it doesn't matter what happens to Summon: Primal Odin