How to Play the Infinite Krenko Combo in Magic: The Gathering Arena

To execute the infinite Goblin combo in Magic: The Gathering Arena Standard, you must control Krenko, Baron of Tin Street, Crime Novelist, and Encroaching Mycosynth alongside one initial artifact. Sacrificing an artifact to Krenko's activated ability triggers Crime Novelist to refund the one red mana ({R}) spent, while Encroaching Mycosynth ensures the newly generated 1/1 Goblin enters as an artifact that can be sacrificed immediately to repeat the loop. Repeating this sequence yields unbounded enters-the-battlefield triggers and arbitrarily large power on both Krenko and Crime Novelist for a lethal combat swing.

Core Combo Engine

The interaction works because Krenko's ability requires no tap cost, allowing unlimited activations in a single turn as long as mana and fodder are available.

Card	Mana Cost	Card Type	Primary Combo Function
Krenko, Baron of Tin Street	{1}{R}{R}	Legendary Creature — Goblin Advisor	Pays {R} and sacrifices an artifact to create a 1/1 red Goblin token with haste.
Crime Novelist	{2}{R}	Creature — Goblin Rogue	Adds {R} and gains a +1/+1 counter whenever you sacrifice an artifact.
Encroaching Mycosynth	{3}{U}	Artifact	Turns all nonland permanents you control into artifacts, making Goblin tokens valid sacrifice fodder.
Voldaren Epicure	{R}	Creature — Vampire	Supplies a cheap Blood token on entry to start the initial sacrifice chain.

Because Crime Novelist refunds the exact red mana spent to activate Krenko, the mana cost remains completely neutral across every iteration. If you also control a token multiplier such as Mondrak, Glory Dominus, each iteration leaves behind an extra hasty Goblin token to build an infinitely wide board.

Step-by-Step Loop Execution

Assemble the pieces in early turns by setting up sacrificial fodder before deploying your key three- and four-mana permanents.

Deploy early artifact fodder: Cast a one-mana permanent such as Voldaren Epicure or Spyglass Siren on turn one or two to place a disposable Blood or Map token on the board.
Resolve Crime Novelist: Cast Crime Novelist on turn three. Its three toughness provides a capable blocker against early aggression.
Establish Krenko and Encroaching Mycosynth: Cast Encroaching Mycosynth and Krenko across turns four and five.
Initiate the sacrifice: Pay {R} and sacrifice your initial artifact token to Krenko's activated ability.
Resolve the stack: Crime Novelist triggers to add {R} and receive a +1/+1 counter. Krenko's passive ability triggers to award Krenko a +1/+1 counter. Krenko's activated ability resolves to create a 1/1 Goblin with haste, which enters as an artifact via Encroaching Mycosynth.
Repeat for lethal damage: Spend the floating {R} to sacrifice the new artifact Goblin token to Krenko. Repeat the sequence until Krenko and Crime Novelist have sufficient power to swing past blockers for game-ending combat damage.

Setup and Protection Strategy

Because this strategy relies on three-mana creatures without built-in ward, successful piloting requires managing interaction and cycling your library efficiently.

Dig for combo pieces: Use cantrips and selection spells like Sleight of Hand, Highway Robbery, and Demand Answers to sculpt your hand. Demand Answers doubles as an instant-speed outlet to turn spare Blood or Treasure tokens into fresh cards.
Manage targeted removal: Avoid playing Crime Novelist into open mana against black decks holding Cut Down or Go for the Throat. Delay the engine until turn five to hold up one-mana defensive spells like Shore Up, Loran's Escape, or Surge of Salvation. Once the loop begins, Crime Novelist quickly grows beyond the range of damage-based spells like Torch the Tower and Lightning Strike.
Navigate sweepers and aggression: Against aggressive decks like Boros Convoke or Mono-Red Aggro, use Crime Novelist early as a high-toughness blocker. Against white control decks running Sunfall, wait for the opponent to tap low before deploying your pieces in a single push.

Arena Interface and Timer Management

Executing loop-intensive combinations in Magic: The Gathering Arena requires active interface management to avoid losing turns to the rope timer.

Disable auto-tapper: The auto-tapper frequently taps untapped physical lands for Krenko's activation instead of consuming floating mana generated by Crime Novelist. Manually click the floating red mana symbol above your avatar for each activation to keep your lands available for protection spells.
Conserve your timer: Every activation requires manual targeting and resolves multiple stack triggers, which rapidly burns your turn clock. Do not loop dozens of times for cosmetic stats. Calculate the opponent's life total and potential blockers, execute only the iterations needed to secure lethal damage, and declare your attack before your turn expires.