Thousand-Year Storm | Narset's Reversal

Cards

({6} magic symbol) ({R} magic symbol) , plus an additional ({U} magic symbol) ({U} magic symbol) available if you have not cast an instant or sorcery this turn available.

Cast
Brass's Bounty by paying ({6} magic symbol) ({R} magic symbol) .
Thousand-Year Storm triggers, creating a copy of
Brass's Bounty for each instant and sorcery spell cast before it this turn.
Resolve the first copy of
Brass's Bounty, if applicable, creating a Treasure artifact token for each land you control.
Repeat step 3 for each remaining copy, if applicable.
If you created Treasures this way, activate two Treasures by tapping and sacrificing them, adding ({U} magic symbol) ({U} magic symbol) .
Holding priority, cast
Narset's Reversal by paying ({U} magic symbol) ({U} magic symbol) , targeting the original
Brass's Bounty.
Thousand-Year Storm triggers, creating a copy of
Narset's Reversal for each instant and sorcery spell cast before it this turn, with each copy targeting the original
Narset's Reversal.
Resolve the first copy of
Narset's Reversal, copying the original
Narset's Reversal targeting
Brass's Bounty, then returning the original
Narset's Reversal to your hand.
All remaining
Narset's Reversal copies made in step 7 fizzle due to having no legal target.
Resolve the
Narset's Reversal copy made in step 8, copying
Brass's Bounty and returning the original
Brass's Bounty to your hand.
Resolve the copy of
Brass's Bounty, creating a Treasure artifact token for each land you control.
Activate seven Treasures by tapping and sacrificing them, adding ({6} magic symbol) ({R} magic symbol) .
Repeat.

This combo has been estimated to be Exhibition (Bracket 1+).