Keywords
Jump
Rule: Jump: the effect happens when the card is played.
Jump marks an effect that happens once, at the moment the card is played from your hand. A Shardling placed for free before the game does not trigger it. Sparkstrike and Wildfire are Jump effects, and so are the pushes of Fogmoth and Phase Serpent.
Tip: Jump effects happen before the opponent can react, so they are the safest way to remove a Shardling or a blocker.