In the Gen 2 games, players first discover the mysterious Pokmon in the Ruins of Alph, which the holographic card faithfully depicts
Arn knew he would never leave Inys Haen again
The poster child for this was of course Arc-Slogger
(7/13/2018) If an effect tries to return a face-down creature to the battlefield after it leaves (such as Aminatou's second ability or Adarkar Valkyrie's delayed triggered ability), that effect returns the card face up
That is why Nala, Lilo, Scar, and Tink matter - they push the board while generating value
For example, Monastery Swiftspear would get two instances of prowess if Bria, Riptide Rogue is on the board, so casting Brainstorm would give Monastery Swiftspear +2/+2 until end of turn