Arcane Bombardment + Inspiring Refrain + Jhoira's Timebug + Capture of Jingzhou + Temporal Manipulation

Arcane Bombardment

Inspiring Refrain

Jhoira's Timebug

Capture of Jingzhou

Temporal Manipulation

How it works

1. Cast Inspiring Refrain by paying 4.
2. Arcane Bombardment triggers, exiling a random instant or sorcery from your graveyard, and then casting a copy of Capture of Jingzhou and Temporal Manipulation without paying their mana costs.
3. Resolve the Capture of Jingzhou and Temporal Manipulation copies, causing you to take two extra turns after this one.
4. Resolve Inspiring Refrain, causing you to draw two cards and exile Inspiring Refrain with three time counters on it.
5. Activate Jhoira's Timebug by tapping it, removing a time counter from Inspiring Refrain.
6. Move to your first extra turn, removing a time counter from Inspiring Refrain during your upkeep.
7. Move to your second extra turn, removing a time counter from Inspiring Refrain during your upkeep.
8. Inspiring Refrain triggers, causing you to cast it from exile without paying its mana cost.
9. Repeat from step 2.

This engine takes full advantage of Arcane Bombardment's ability to repeatedly cast free copies of your graveyard spells whenever you cast your first instant or sorcery each turn. By ensuring spells like Capture of Jingzhou and Temporal Manipulation are continually recast, you lock down an endless succession of extra turns while drawing fresh cards and exiling Inspiring Refrain with time counters. Jhoira's Timebug accelerates this suspension process by manually shaving away those time counters, seamlessly bridging the gap so that Inspiring Refrain resets right on schedule to feed the Bombardment anew.