The Agents of S.N.E.A.K.—Spies Nimbly Eluding Adversaries' Knives.

Sly Spy

Whenever Sly Spy deals combat damage to a player, that player reveals the top card of their library. Put that card into your hand and you lose life equal to its mana value.

The Agents of S.N.E.A.K.—Serious, Nonstop Espionage and Kidnapping.

Unstable

Whenever Sly Spy deals combat damage to a player, that player reveals his or her hand. You choose a card from it with the longest name. That player discards that card.

Whenever Sly Spy deals combat damage to a player, that player reveals their hand. You choose a card from it with the longest name. That player discards that card.

The Agents of S.N.E.A.K.—Silent Ninjas Evading Any Kapture.

Whenever Sly Spy deals combat damage to a player, you may destroy target creature facing left in its art. (Creatures without faces don't face anywhere.)

The Agents of S.N.E.A.K.—Sinister Nerds Eliminating All Knowledge.

Whenever Sly Spy deals combat damage to a player, that player loses a finger until Sly Spy leaves the battlefield. (The finger is chosen by its owner and can't roll dice or touch cards.)

The Agents of S.N.E.A.K.—Skilled, Notably Efficient Assassin-Kickers.

Whenever Sly Spy deals combat damage to a player, you may destroy target creature facing right in its art. (Creatures without faces don't face anywhere.)

Whenever Sly Spy deals combat damage to a player, that player reveals the top card of his or her library. Put that card into your hand and you lose life equal to its converted mana cost.

If you cast a permanent card put into your hand this way, you’ll control the permanent it becomes. However, Sly Spy doesn’t change who its owner is. It’s put into its owner’s graveyard. If it’s returned to its owner’s hand, it will go to the hand of its actual owner, and so on.

If you cast an instant or sorcery card put into your hand this way, it’ll be put into its owner’s graveyard as it resolves.

While the card is in your hand, if it would be shuffled into your library, it’s instead shuffled into its owner’s library.