Aang, Airbending Master Aang, Airbending Master makes experience counters a real threat by turning each one into token value every upkeep
However, if you copy that permanent with Heat Shimmer, the Mistcutter Hydra copy enters with 0 +1/+1 counters and presumably dies
This is the ninth outside-designer card
Its only when we consider the card in practice, and the flavor text, that we realize the victim is probably a corpse already
7 mana is really expensive for a commander, however, and 6 isnt much better from Phylath, so Id recommend playing a lot of ramp and card draw if you elect to build decks around these legendary creatures
You won't be able to gain life during your end step in time to have the ability trigger