Auntie's Snitch

This creature can't block.
Prowl {1}{B} (You may cast this for its prowl cost if you dealt combat damage to a player this turn with a Goblin or Rogue.)
Whenever a Goblin or Rogue you control deals combat damage to a player, if this card is in your graveyard, you may return this card to your hand.

Modern Masters

Auntie's Snitch can't block.
Prowl {1}{B} (You may cast this for its prowl cost if you dealt combat damage to a player this turn with a Goblin or Rogue.)
Whenever a Goblin or Rogue you control deals combat damage to a player, if Auntie's Snitch is in your graveyard, you may return Auntie's Snitch to your hand.

Morningtide

Auntie's Snitch can't block.
Prowl {1}{B} (You may play this for its prowl cost if you dealt combat damage to a player this turn with a Goblin or Rogue.)
Whenever a Goblin or Rogue you control deals combat damage to a player, if Auntie's Snitch is in your graveyard, you may return Auntie's Snitch to your hand.

If a Goblin or Rogue you control deals combat damage to a player while Auntie's Snitch is in your graveyard, you can return Auntie's Snitch to your hand, then you can cast it for its prowl cost that turn.

The last ability will trigger only if Auntie's Snitch is in your graveyard at the moment a Goblin or Rogue deals combat damage to a player. The ability will check again when it tries to resolve. If Auntie's Snitch hasn't left the graveyard by this time, you may return it to your hand.