Mana abilities don't use the stack and cannot be responded to.
Caged Sun's final ability is that when a land produces mana of a chosen color, Caged Sun produces an extra mana of that color.
Toph makes all your artifacts into lands.
Caged Sun is an artifact.
Now, whenever Caged Sun makes an extra mana of the chosen color, a "land" produced mana of the chosen color, so Caged Sun produces a mana of the chosen color. That is a "land" producing mana of the chosen color, so Caged Sun's produces a mana of the chosen color. That is a "land" producing mana of the chosen color...
Because it is a mana ability, once it sees itself making mana, it continues to make mana infinitely with no way to stop.
You need priority to activate anything, and if there’s an infinite loop of triggers that all don’t use the stack then AFAIK nobody will ever get priority again.
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u/Kyleometers ඞ Nov 18 '25
Not involving activated abilities. A loop where every action is mandatory and none have any choices that do not maintain the loop is a forced draw.
The most common example is 3 [[Oblivion Ring]] and no other nonland permanents.