
Players don't lose unspent mana as steps and phases end.
Upwelling has 3 printings, first in Scourge (2003). EDHREC ranks it #14,476 among Commander cards. It appears most in Kynaios and Tiro of Meletis decks (1,341 on EDHREC). It has 1 official ruling.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.