First, Galvanic Relay makes you play the exiled cards on your next turn, not the current turn, so youll be slightly less pressed for mana
For new entrants, it is an entry point

Collection Status You must be logged in to track your collection #1 - Scyther #2 - Yanma #3 - Yanmega #4 - Carnivine #5 - Serperior V #6 - Serperior VSTAR #7 - Petilil #8 - Hisuian Lilligant #9 - Radiant Tsareena #10 - Zarude #11 - Calyrex #12 - Growlithe #13 - Arcanine #14 - Entei #15 - Reshiram V #16 - Fennekin #17 - Braixen #18 - Delphox #19 - Volcanion #20 - Salandit #21 - Salazzle #22 - Alolan Vulpix V #23 - Alolan Vulpix VSTAR #24 - Articuno #25 - Wailmer #26 - Wailord #27 - Feebas #28 - Milotic #29 - Luvdisc #30 - Kyogre #31 - Radiant Alakazam #32 - Exeggcute #33 - Exeggutor #34 - Jynx #35 - Mewtwo #36 - Ralts #37 - Kirlia #38 - Gardevoir #39 - Mawile V #40 - Mawile VSTAR #41 - Espurr #42 - Meowstic #43 - Tapu Lele #44 - Scizor #45 - Radiant Jirachi #46 - Klink #47 - Klang #48 - Klinklang #49 - Pawniard #50 - Bisharp #51 - Magearna V #52 - Zacian #53 - Zamazenta #54 - Smeargle #55 - Ho-Oh V #56 - Swablu #57 - Altaria #58 - Chatot #59 - Energy Switch #60 - Capture Aroma #61 - Switch #62 - Emergency Jelly #63 - Judge #64 - Serena #65 - Furisode Girl #66 - Wallace #67 - Double Turbo Energy #68 - V Guard Energy #69 - Braixen #70 - Milotic #71 - Jynx #72 - Gardevoir #73 - Smeargle #74 - Altaria #75 - Serperior V #76 - Reshiram V #77 - Alolan Vulpix V #78 - Mawile V #79 - Magearna V #80 - Ho-Oh V #81 - Serena #82 - Furisode Girl #83 - Wallace #84 - Serperior V #85 - Mawile V #86 - Serperior VSTAR #87 - Alolan Vulpix VSTAR #88 - Mawile VSTAR #89 - Serena #90 - Furisode Girl #91 - Wallace #92 - Serperior VSTAR #93 - Energy Switch #94 - V Guard Energy

[14] The black line is very thin, so you might need a magnifying glass to see it
It helps that its useful enough to actually use, too
Pokmon collectibles expert Emchompite says to check the font used on the card, as fakes often use a slightly different font thats thinner or bolder than the text on real cards