
Whenever a player taps a Mountain, Forest, or Plains for mana, that player adds one mana of any type that land produced.
Keeper of Progenitus has 1 printing, first in Shards of Alara (2008). EDHREC ranks it #14,298 among Commander cards. It appears most in Yurlok of Scorch Thrash decks (2,925 on EDHREC).
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.