If a legend has two tap abilities (e.g., Ornn with Forge of the Fluft), can both abilities be used when tapping the legend once, or must you choose one?

Ruling: You cannot use both abilities with a single tap. Each tap ability requires its own separate exhaust cost, so you must choose which one to use.

Nuances:

• The abilities require you to exhaust the legend as a cost; they are not triggered effects that happen "when you exhaust"