At the beginning of your upkeep, put a time counter on Infinite Hourglass.
All creatures get +1/+0 for each time counter on Infinite Hourglass.
(3): Remove a time counter from Infinite Hourglass. Any player may play this ability but only during any upkeep step.
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Infinite Hourglass Discussion
2 days ago
I think Dragon Scales would be a good include for your deck since it always gives an auto-buff and Vigilance to your commander.
Lastly Retribution of the Ancients might be worth considering. Even though its the same effect your commander has, you don't have to remove all the counters with its effect making the killing of your opponents creatures much more efficient.