You play them in the same way you play other cards that fit multiple roles, to smooth out your ratios and effects
Its attack, Hyrdo Knuckle, costs one Fighting Energy and two Colorless Energy
(Note that this is something design would do
Panoptic Mirror-Timewalk 5/10 In a powered cube this is a seven mana combo, unpowerd it becomes ten although you can still do it just as quickly (assuming you are not ramping into the Panoptic Mirror with something like a Mana Vault)
Creature Squirrel Uncommon Dan Murayama Scott 1/1 NOT LEGAL Standard NOT LEGAL Future LEGAL Historic LEGAL Timeless LEGAL Gladiator NOT LEGAL Pioneer NOT LEGAL Explorer LEGAL Modern LEGAL Legacy NOT LEGAL Pauper LEGAL Vintage NOT LEGAL Penny LEGAL Commander LEGAL Oathbreaker NOT LEGAL Standardbrawl LEGAL Brawl NOT LEGAL Alchemy NOT LEGAL Pauper Commander LEGAL Duel NOT LEGAL Oldschool NOT LEGAL Premodern NOT LEGAL Predh Whenever you sacrifice an artifact or creature, put a +1/+1 counter on this creature
Doesn't take much imagination to see this getting out of hand quickly, as a single burn spell just eliminated each opponent's life total by more than half