Quintorius Kand + Flicker + Bonus Round + Mystic Sanctuary

Quintorius Kand

Flicker

Bonus Round

Mystic Sanctuary

How it works

1. Cast Bonus Round by paying 1, causing each player to copy each instant or sorcery spell they cast this turn.
2. Cast Flicker by paying 1, targeting Mystic Sanctuary.
3. Bonus Round triggers, copying Flicker targeting Quintorius Kand.
4. Resolve the copy of Flicker, blinking Quintorius Kand.
5. Resolve the original Flicker, blinking Mystic Sanctuary.
6. When Mystic Sanctuary enters the battlefield, it triggers, putting Flicker on top of your library from your graveyard.
7. Activate Quintorius Kand's second loyalty ability by removing three loyalty counters from it, causing you to exile Flicker from the top of your library and cast it without paying its mana cost, targeting Mystic Sanctuary.
8. Quintorius Kand and Bonus Round trigger.
9. Resolve the Quintorius Kand trigger, dealing 2 damage to each opponent and causing you to gain 2 life.
10. Resolve the Bonus Round trigger, copying Flicker targeting Quintorius Kand.
11. Repeat from step 4.

This explosive loop relies on Bonus Round to double every instant or sorcery you cast, creating a cascading sequence of copies with each iteration. By using Flicker to blink Mystic Sanctuary, you continuously return Flicker from your graveyard to the top of your library, setting up the next cast. Meanwhile, Quintorius Kand provides both the engine and the win condition, using its minus ability to cast Flicker from exile while its triggered ability drains your opponents' life totals for the win.