Cadaver Imp [Mystery Booster] Legends Tokens As long as Elturel Survivors

As long as Elturel Survivors is attacking

Set: March of the Machine Commander Type: Legendary Sorcery Rarity: Rare Cost: {4}{B} (You may cast a legendary sorcery only if you control a legendary creature or planeswalker

Set: Innistrad: Crimson Vow Type: Artifact — Clue Rarity: Rare Cost: {2} Investigator's Journal enters the battlefield with a number of suspect counters on it equal to the greatest number of creatures a player controls

000 Type: Artifact — Equipment Rarity: Uncommon Cost: {4} Equipped creature gets +2/+2

Now it burns in my mind

Cadaver Imp [Mystery Booster] Legends Tokens As long as Elturel SurvivorsSet: Mystery Booster Type: Creature Imp Rarity: Common Cost: {1}{B}{B} Flying When Cadaver Imp enters the battlefield, you may return target creature card from your graveyard to your hand. The mouth must be pried open before rigor mortis sets in. Otherwise the returning soul can find no ingress.