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You have cumulative upkeep of one, so it doesn't last forever, but you are dropping one land per turn, so as long as you hit your land drop, this can be kept up for a few turns

Starfield Vocalist This Has The X-Factor Any card that can double an enter trigger is immediately going to be worth playing

And it's on-curve colorless card for any occasion

It is the one that makes for good games, good stories, and at least one moment where the table's laughing gleefully before making you the Archenemy

+1/+1 counter synergies are very desirable too, and Doubling Season fits perfectly (although this is true for green EDH decks in general)