Time Sieve + Myr Battlesphere + Lin Sivvi, Defiant Hero + Maskwood Nexus

Time Sieve

Myr Battlesphere

Lin Sivvi, Defiant Hero

Maskwood Nexus

How it works

1. Activate Lin Sivvi's first ability by paying 7 and tapping it, causing you to search your library for Myr Battlesphere and put it onto the battlefield.
2. When Myr Battlesphere enters the battlefield, it triggers, creating four 1/1 Myr artifact creature tokens.
3. Activate Time Sieve by tapping it, sacrificing Myr Battlesphere and the four Myr tokens, causing you to take an extra turn after this one.
4. Activate Lin Sivvi's second ability by paying 3, putting Myr Battlesphere on the bottom of your library from your graveyard.
5. Repeat each turn.

This ingenious loop revolves around Maskwood Nexus, whose passive ability turns every creature you control and own—including those in your graveyard—into Rebels alongside all other creature types. This universal typing transforms Lin Sivvi, Defiant Hero into a universal tutor and recycler, letting her first ability fetch Myr Battlesphere directly to the battlefield. When Myr Battlesphere enters, its triggered ability floods your board with four Myr artifact creature tokens, giving you the exact five artifacts needed to instantly sacrifice to Time Sieve for an extra turn. Finally, Lin Sivvi's second ability uses the graveyard recursion enabled by Maskwood Nexus to shuffle Myr Battlesphere right back into your library, ready to be pulled out all over again on your next turn.