Lands you control can tap to produce at least ({3} magic symbol) ({UR} magic symbol) ({UR} magic symbol) ({U} magic symbol) ({U} magic symbol) .
Steps
During an opponent turn, activate all mana producing lands you control by tapping them, adding at least ({3} magic symbol) ({UR} magic symbol) ({UR} magic symbol) ({U} magic symbol) ({U} magic symbol) .
Activate
Soulfire Grand Master by paying ({2} magic symbol) ({UR} magic symbol) ({UR} magic symbol) , causing you to put the next instant or sorcery spell you cast this turn into your hand as it resolves.
Cast
Reset by paying ({U} magic symbol) ({U} magic symbol) , untapping all lands you control and putting
Reset into your hand as it resolves due to
Soulfire Grand Master.
Repeat.
Results
Infinite magecraft triggers.
Infinite mana lands you control can produce.
Infinite storm count.
Metadata
In 24 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Spicy (Bracket 3-4+).