Unstoppable Slasher 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

Deathtouch Whenever this creature deals combat damage to a player, they lose half their life, rounded up. When this creature dies, if it had no counters on it, return it to the battlefield tapped under its owner's control with two stun counters on it.

Complete guide

Unstoppable Slasher is a terrifying addition to aggressive black decks, offering both a potent threat and a resilient body that refuses to stay in the graveyard. This Zombie Assassin not only threatens to cut a player's life total in half with a single strike but also returns to the battlefield after being dealt with.

Precision and Persistence

Unstoppable Slasher features a triggered ability that occurs whenever it deals combat damage to a player. The loss of life is calculated as half of the player's current life total, rounded up. Additionally, it has a built-in recursion mechanic: if it dies while it has no counters on it, it returns to the battlefield tapped with two stun counters. Because it returns with stun counters, it will not return again if it dies while those counters remain, as the ability specifically checks for the absence of counters.

Step-by-Step Resolution

When Unstoppable Slasher attacks and is not blocked, it first deals damage equal to its power. Immediately after, its triggered ability goes on the stack. When the ability resolves, the game checks the opponent's current life total, divides it by two, rounds up, and that player loses that much life. If the Slasher dies, the game checks its status as it last existed on the battlefield. If it had no counters (including +1/+1 counters or keyword counters), the recursion ability triggers, bringing it back to the battlefield tapped with two stun counters during the resolution of the trigger.

Common Pitfalls

A common mistake is forgetting that 'loss of life' is not the same as 'damage.' While the initial 2 damage from Unstoppable Slasher is combat damage, the subsequent loss of half their life is not. Another frequent error involves the recursion; if an opponent puts a -1/-1 counter or a stun counter on the Slasher before it dies, the recursion ability will not trigger because the creature did not have 'no counters' on it when it died.

Strategic Timing

Play Unstoppable Slasher when you can capitalize on its Deathtouch to force through damage or when you have ways to remove counters. Since it returns tapped with stun counters, it will be sidelined for several turns unless you use effects to untap it or proliferate/remove counters. It is an excellent target for sacrifice outlets, as it provides a 'free' body to use again later.

Interaction examples

Doubling the Carnage

Roaming Throne

If you have Roaming Throne on the battlefield with 'Zombie' or 'Assassin' chosen, Unstoppable Slasher's combat damage trigger will trigger twice. If an opponent at 20 life takes combat damage, the first trigger will cause them to lose 10 life (half of 20). The second trigger then resolves, checking the new life total of 10 and causing them to lose another 5 life (half of 10), leaving them at 5 life total.

The Slasher's Return

Solemn Simulacrum

If your opponent casts a spell to destroy all creatures, both Unstoppable Slasher and Solemn Simulacrum are put into the graveyard. Solemn Simulacrum's ability allows you to draw a card. Since Unstoppable Slasher had no counters on it before the destruction, its ability triggers and resolves, returning it to the battlefield tapped with two stun counters. It is now ready to eventually untap and continue the assault.

Guide written with AI from the official text and rulings. Official English text prevails.