op12 legacy of the master booster box One Piece Sealed Case (12x Boxes) En – Evolution TCG [26] Rares OP12 Booster Box English Legacy

An ability that triggers when a creature "leaves the battlefield" will trigger twice if that creature leaves the battlefield by dying

With Round an attack that costs three Colorless Energy Seismitoad deals 70 damage for each Pokmon in play that also has the Round attack

The designers explain that it was always meant to be a mandatory effect and not an optional one

30 Magic: The GatheringEdge of Eternities Play Booster Packs

Theres a catch though, just like Sleepys Flute from the previous set only working if youve played a song this turn, the Airfoil only gives you that free card if youve played two actions this turn