This also leads me to the very first 1st edition Pokmon TCG cards: Japanese No Rarity Base Set: Unlike later print runs, the Japanese Base Set has no 1st edition symbol to indicate that its 1st edition
As for Standard and Limited play, we expect to see it a fair bit, especially in Standard, as it could easily slot into the current Simic Ouroboroid or Mono-Green Landfall decks
Once it resolves, you add one red mana for each card in an opponents hand, that mana sticks around through phases until the end of the turn, and then Inspiring Refrain resuspends itself with another three time counters, letting you cast it again later
I wouldnt say its useless in Constructed play, but I dont really see it being anyones first choice unless youre specifically building around adventure cards
As fragile as Geist is as a 2/2, its easy to give evasion to it via equipment or buff via auras