Launch is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Enchant creature Enchanted creature has flying. When this Aura is put into a graveyard from the battlefield, return it to its owner's hand.

How it works : Launch

Original English text — Wizards of the Coast / Scryfall

No additional ruling has been published for this card.

Popular combos

Real combos played by the community, sorted by popularity.

#1
Mycosynth Lattice + Krark-Clan Ironworks + Launch
Infinite storm count
1Activate Krark-Clan Ironworks by sacrificing Launch, adding .
2Launch triggers, returning itself to your hand from your graveyard.
3Cast Launch by paying , attaching it to a creature you control.
4Repeat.

#1
Mycosynth Lattice + Krark-Clan Ironworks + Launch
Infinite storm count
1Activate Krark-Clan Ironworks by sacrificing Launch, adding .
2Launch triggers, returning itself to your hand from your graveyard.
3Cast Launch by paying , attaching it to a creature you control.
4Repeat.

Interactions with other cards

These cards' text mentions Launch.

Fodder Launch

As an additional cost to cast this spell, sacrifice a Goblin. Target creature gets -5/-5 until end of turn. Fodder Launch deals 5 damage to that creature's controller.