When playing a card with Acceleration for free (ignoring cost), do you still have to pay the Acceleration cost?

Ruling: When an effect lets you play a card without paying the cost (ignoring cost), you only ignore the printed base cost. You must still pay additional costs like Accelerate.

Nuances:

• Effects that "reduce" the cost (rather than ignore it) can reduce the Accelerate cost as well, since reductions apply after cost increases.