Trusted online spots like eBay and TCGPlayer mean a huge audience and massive potential returns, but they involve more work (listing and shipping)
Here is roughly what each rating means: 1 = Garbage - These cards are unplayable in nearly all circumstances
Blow the Whistle allows him to shut down opponent actions until the start of the player's next turn, potentially neutralizing powerful songs and more
While supplies last, and only through WPN game stores, purchasing a booster display of The Lost Caverns of Ixalan Set, Draft, or Collector Boosters may include an additional traditional foil promo version of Jadelight Spelunker: Visit your local WPN game store for all the details
Anyway, lets say it was 50%, that still means that opt is 75% of the effect of Preordain, an established top end card quality spell
Previously all 3 damage Rush characters or actions were costing you 3 ink or more