Triassic Egg [Legends] Cat The key did not work

The key did not work on a single lock

you may search your library for an Ally creature card

that player may choose any number of tapped creatures without flying they control and pay {2} for each creature chosen this way

Set: Duel Decks: Merfolk vs

Triassic Egg [Legends] Cat The key did not workSet: Legends Type: Artifact Rarity: Rare Cost: {4} {3}, {T}: Put a hatchling counter on Triassic Egg. Sacrifice Triassic Egg: Choose one. Activate only if there are two or more hatchling counters on Triassic Egg. You may put a creature card from your hand onto the battlefield. Return target creature card from your graveyard to the battlefield.