Unless your list is full of Faithless Looting, Vryn's Prodigy and Brainstorm this doesn't seem worth it
In Mystic Remora's case, you pay one generic mana during your next upkeep, then two mana, then three, and so on until you don't pay the cost anymore
Those amounts are then doubled to 2 and 6, respectively
When this enchantment is put into a graveyard from the battlefield, you lose the game
Immensely popular in Commander, it's both one of the best colorless lands (since it's a colorless card it fits literally any deck) and one of the best 5-color lands (since it can produce mana from any of your foes' colors), providing superb fixing pretty much everywhere outside mono-color decks
Alongside this helpful ability, Archon of Emeria also prevents your opponents nonbasic lands from coming into play untapped