Dragon Form
Card Text & Abilities
Choose a unit. Its base Might becomes 5 this turn. [Flow] [3] (You may play this from your trash for its Flow cost. Then banish it.)
Official Rules FAQ & Clarifications
1 Official FAQAlthough Dragon Form sets the base Might of a unit to 5 [M], it does so via layers. Layers are evaluated when the effect is applied and their evaluation includes all existing applied layer alterations. We process layers in order, starting from the Trait-Altering layer (where this base Might setting effect is applied), proceeding to the Ability-Altering layer (not part of this example), and proceeding to the Arithmetic layer (where Stupefy’s -1 [M] is applied), but this process happens instantaneously; there is no window while evaluating layers for the unit to see itself become 5 [M] and then go down to 4 [M]. As soon as the effect of Dragon Form is applied, the unit is 4 [M].
As a side note, Might is one of the traits that is managed in the Trait-Altering layer, and it is one of the copyable traits that copy effects can replace or add to.