This won't touch generic mana costs or other colors, and it only works on permanents, which was clearly done to keep them from getting broken by casting free Brainstorms, counters, Lightning Bolts, Swords to Plowshares, etc
Evolves From Other cards with Burning Bonemerang Cards by Gemi Frequently Asked Questions How can I obtain the Alolan Marowak with 1-Star rarity from the Celestial Guardians set
As such, if now information becomes available, or if it turns out I made some mistakes, Ill come back and edit this to the best information I can give you
Mana burn, baby
It's a gamble!
[ Editor's Note: The updated rules for Planar Magic cap the number of phenomenon cards at two, for an individual's own Planar deck, or twice the number of players starting the game, for multiplayer games using one shared Planar deck.] Even assuming only two phenomena per deck, Interplanar Tunnel at worst puts four planes that you dont want now at the bottom of your planar deck, bringing you that much closer to the plane you are looking for
