Cast any other spell, or wait for an opponent to cast one.
Cast Lapse of Certainty by paying {2}{W}, targeting that spell.
Swarm Intelligence and Thrumming Stone trigger.
Resolve the Swarm Intelligence trigger, creating a copy of Lapse of Certainty, targeting the original Lapse of Certainty.
Resolve the copy of Lapse of Certainty, countering the original Lapse of Certainty and putting it on top of your library.
Resolve the Thrumming Stone trigger from step 3, revealing the top four cards of your library and casting Lapse of Certainty without paying its mana cost.
Repeat from step 3.

Infinite magecraft triggers

Infinite storm count

Thrumming Stone

Lapse of Certainty

Swarm Intelligence

Cast Bonus Round by paying {1}{R}{R}.
Thrumming Stone triggers, revealing the top four cards of your library and putting them on the bottom of your library.
Resolve Bonus Round, copying all instants and sorceries cast after it this turn.
Cast any other spell, or wait for an opponent to cast one.
Cast Lapse of Certainty by paying {2}{W}, targeting that spell.
Bonus Round and Thrumming Stone trigger.
Resolve the Bonus Round trigger, creating a copy of Lapse of Certainty, targeting the original Lapse of Certainty.
Resolve the copy of Lapse of Certainty, countering the original Lapse of Certainty and putting it on top of your library.
Resolve the Thrumming Stone trigger from step 6, revealing the top four cards of your library and casting Lapse of Certainty without paying its mana cost.
Repeat from step 6.

Bonus Round

Cast any other spell, or wait for an opponent to cast one.
Cast Lapse of Certainty by paying {2}{W}, targeting that spell.
Thousand-Year Storm and Thrumming Stone trigger.
Resolve the Thousand-Year Storm trigger, creating at least one copy of Lapse of Certainty, with each copy targeting the original Lapse of Certainty.
Resolve the first copy of Lapse of Certainty, countering the original Lapse of Certainty and putting it on top of your library.
All remaining Lapse of Certainty copies fizzle due to no longer having a legal target.
Resolve the Thrumming Stone trigger from step 3, revealing the top four cards of your library and casting Lapse of Certainty without paying its mana cost.
Repeat from step 3.

Thousand-Year Storm

Cast any other spell, or wait for an opponent to cast one.
If you cast the spell, Displacer Kitten triggers, blinking Chandra.
Cast Lapse of Certainty by paying {2}{W}, targeting that spell.
Chandra, Displacer Kitten and Thrumming Stone trigger.
Resolve the Chandra trigger, creating a copy of Lapse of Certainty, targeting the original Lapse of Certainty.
Resolve the copy of Lapse of Certainty, countering the original Lapse of Certainty and putting it on top of your library.
Resolve the Displacer Kitten trigger, blinking Chandra.
Resolve the Thrumming Stone trigger from step 3, revealing the top four cards of your library and casting Lapse of Certainty without paying its mana cost.
Repeat from step 4.

Combos with "Lapse of Certainty"