When Switcheroo is cast during combat on units with Assault and Shield, do those passive effects transfer with the might swap, and what are the final might values?

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Accepted Answer

No. Switcheroo only swaps the numeric Might values of the two units; it does not move keywords or passive abilities like Assault or Shield. The swap uses each unit's current Might (including continuous modifiers such as Rumble - Mechanized Menace’s "+1 Might while they're defenders") to compute the change, so each unit ends up with the other's pre-swap numeric Might this turn [433] [710].

Passive abilities (for example, an attacker’s granted Assault or a mech’s Shield from Rumble - Mechanized Menace) do NOT transfer when Switcheroo resolves. Only the numeric Might values are swapped, and those numeric values include any continuous Might modifiers that were already applying at the moment of the swap. Concretely, if Unit A’s current Might = X and Unit B’s current Might = Y when Switcheroo resolves, Unit A becomes Y Might and Unit B becomes X Might for the turn [433] [710].

Establish each unit's current Might immediately before Switcheroo resolves. This includes base Might and any continuous modifiers that are currently applying (for example Rumble - Mechanized Menace’s "+1 Might while they're defenders"). [710] Compute the difference between the two current Might values and apply the Swap by increasing the lower value by that difference and decreasing the higher value by that same difference, per the swap procedure. This produces two temporary Might modifiers that last for the turn. [433] Do not move or copy keywords or passive abilities. Abilities such as a unit's granted Assault (a non-numeric keyword granted by an effect) or a Shield granted to "Your Mechs" by Rumble - Mechanized Menace remain tied to the unit(s) that have those properties; they are not transferred by swapping numeric Might. After the swap has been applied, re-evaluate current Might as the sum of base Might + continuous effects + the swap modifiers. That final value is the unit's Might for the remainder of the turn unless other effects change it. [710] [433]

If one of the two units is not on the board when Switcheroo would resolve, the swap cannot target it and the effect will not proceed for that pair (targets or selection would be illegal) — follow standard targeting/legality rules when playing spells. If a continuous effect that contributed to a unit's pre-swap Might (for example the +1 from Rumble - Mechanized Menace) ceases to apply after the swap (the unit stops being a Mech or stops being a defender), that continuous change will be reflected when current Might is re-evaluated; the swap’s temporary increase/decrease remain as applied but the continuous modifier may change the final numeric result [710] [433]. If both units had the same numeric Might at the time Switcheroo resolves, the swap will have no numeric effect (per 433.1.c.). Keywords and passives remain unchanged.

Swap only exchanges numeric Might values; it does not move keywords or passive abilities. The swap procedure in Switcheroo follows the Swap rules: determine the difference between the two units' current Might values (this "current" value already includes continuous modifiers such as Rumble - Mechanized Menace's "+1 Might while they're defenders") and then apply an Increase to the lower value and a Decrease to the higher value equal to that difference, causing their numeric Might values to be reversed for the turn [433] [710].

Keywords like Assault and Shield are not numeric values and are not part of the swap instruction, so they remain with their original units. For example, a 0 Might Shadow Clone token that has been granted Assault 4 when it attacks keeps that Assault keyword after Switcheroo resolves; Switcheroo only gives it the other unit's numeric Might, it does not grant it the other unit's keywords. Likewise, Rumble - Mechanized Menace's granted Shield remains tied to your Mech units — the Mech remains a Mech and continues to receive whatever continuous effects apply to it; those continuous effects were included when computing the swap but are not transferred as separate abilities.

Numeric example (common scenario): the Mech has base 3 Might and is a defender, so with Rumble - Mechanized Menace it is currently 4 Might. The Shadow Clone token is 0 Might. When Switcheroo resolves we compute difference D = 4 - 0 = 4, then give the Clone +4 and give the Mech -4. Final Might this turn: Clone = 4, Mech = 0. The Clone still retains any Assault it had; the Mech still retains Shield if it remains a Mech/defender. This matches the rule that units are evaluated by their current Might and that swap only operates on numeric values [710] [433].