Time Sieve + Myr Battlesphere + Conjurer's Closet + Panharmonicon

Time Sieve

Myr Battlesphere

Conjurer's Closet

Panharmonicon

How it works

1. At the beginning of your end step, Conjurer's Closet triggers, blinking Myr Battlesphere.
2. When Myr Battlesphere enters the battlefield, its first ability triggers twice, creating eight 1/1 Myr artifact creature tokens.
3. Activate Time Sieve by tapping it and sacrificing five Myrs, causing you to take an extra turn after this one.
4. Repeat each turn.

This brilliant loop is built around the heavy influx of metal brought by Myr Battlesphere, whose entrance is dramatically amplified by Panharmonicon to flood your board with eight Myr artifact creature tokens in a single sweep. Conjurer's Closet ensures this engine never runs out of fuel by continuously blinking the Battlesphere at the start of every end step, setting you up to feed those freshly minted tokens directly to Time Sieve. By cashing in five of those mechanical minions, Time Sieve happily hands you infinite extra turns, locking down the game through sheer relentless momentum.