Yarok, the Desecrated + Time Sieve + Myr Battlesphere + Thassa, Deep-Dwelling

Yarok, the Desecrated

Time Sieve

Myr Battlesphere

Thassa, Deep-Dwelling

How it works

1. At the beginning of your end step, Thassa 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 delightful engine locks down the game by turning your end step into an endless factory of extra turns. It all starts with Thassa, Deep-Dwelling, whose passive end-step ability quietly snatches away Myr Battlesphere and returns it fresh to the battlefield. Because Yarok, the Desecrated is on the board acting as a magnificent force multiplier, that entrance doubles the Myr Battlesphere trigger, flooding your side of the table with eight 1/1 colorless Myr artifact creature tokens instead of the usual four. With that massive surplus of artifacts ready and waiting, you can simply tap Time Sieve and sacrifice five of those newly minted Myrs to buy yourself an extra turn, repeating the cycle anew on each of your subsequent turns.