The Aura you probably really want here is old classic Rancor
Deck List Syzygy Synergy Solrocks Sun Energy Ability empowers your Lunatone with Energy so it can then disrupt your opponents strategy with Moon Kinesis, an attack that can do 120 damage if you use the minimum three Energy and that adds 30 more damage for each additional Energy
And we do have a precedent for a recent run of Commander decks increasing in price several years after release: Commander 2014
It can be found in the pack from the DeluxePackEx set
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When a goaded creature hits someone else, Firkraag gets stronger and you draw a card