Anything that impacts +1/+1 counters is a good shout, but there are some cards that do a lot more work than others
Still, as far as creatures go, Gurmag Angler and Tasigur, the Golden Fang are pretty mana efficient (and its not like Tombstalker is a slouch, either)
But maybe we try not to attack so much and actually ramp our way to cursing our opponents
I did get a lot of comments that players wished start your engines
Etali, Primal Storm You know whats essential to Commander
These are alternate versions of existing cards that reuse Standard artwork but get a premium treatment, including an "open air" frame, rainbow foiling, and glossy highlights