If I pay additional cost for Akshan and proc Weaponmaster first to equip Svellsongur, will Svellsongur copy Akshan's second ability allowing me to steal 2 gear?

Ruling: No, you cannot steal 2 gear this way. Weaponmaster and Akshan's second ability trigger at the same time, so by the time Svellsongur is attached to Akshan, it's too late for it to copy the ability that has already triggered.

Nuances:

• Svellsongur does not work well with on-play abilities because it needs to be attached before the ability triggers to copy it
• Even with Quickdraw (via Jax), playing Svellsongur in reaction to Akshan's on-play ability is still too late since the ability has already triggered
• If Akshan is banished after gear is attached (e.g., via Arcane Shift), the gear detaches and returns to its owner's base