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How does Sunstorm’s ability work with Actions or Upgrades that raise his attack?

Sunstorm’s ability sets his base attack value, what you’d see printed on the card if it didn’t change.
From there, Actions and Upgrades can raise that value. For example, if you have 3 cards in hand, his
base attack would be 3. If he then got a Weapon that gave him +2 attack, his attack would be 5. This
wouldn’t change the number of cards in your hand.
Source: Wizards of the Coast (2018-10-11)    【Link to Ruling】
Tags: Sunstorm, Fusion Flyer