However, there are those who say (and here it may be a majority opinion) that the effort is not worth it, as the prize pool at the end of the season can be mediocre compared to the time dedicated to staying in the Mythic and, even so, being in the Mythic you may not be ranked high enough to be invited to an event

Everything Comes to Dust Four Knocks The Girl in the Fireplace Ian Chesterton Jo Grant The Night of the Doctor The Pandorica Peri Brown Romana II Tegan Jovanka Trial of a Time Lord The War Games The Wedding of River Song Wilfred Mott Adric, Mathematical Genius All of History, All at Once An Unearthly Child Auton Soldier Become the Pilot Cyber Conversion Danny Pink Don't Blink The Eleventh Hour Five Hundred Year Diary Flatline Flesh Duplicate The Flood of Mars Hunted by The Family K-9, Mark I Martha Jones Nanogene Conversion Nardole, Resourceful Cyborg Nyssa of Traken Quantum Misalignment Renegade Silent Reverse the Polarity Star Whale Start the TARDIS Surge of Brilliance Time Beetle Time Lord Regeneration Traverse Eternity Twice Upon a Time Twice Upon a Time Wibbly-wobbly, Timey-wimey Zygon Infiltrator Dalek Drone Dalek Squadron Death in Heaven Doomsday Confluence Exterminate
A gentle, sleeping, quietly terrifying monster
In the matchups such as Arceus & Dialga & Palkia GX/Zacian V which the Lucario & Melmetal GX decks damage output is important this card cannot be played and just be used as discard fodder
For example, you could reveal Sunken Hollow from the Battle for Zendikar set to satisfy the ability of Foreboding Ruins