If a spell has in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost
While it may not be the card thats been sold for the highest amount, you cant pick up a $40 version of this (that isnt a proxy), which cant be said for The One Ring
Despite being fairly terrible when it released, Keruga has since seen a surge in use in Commander, as part of the 99 in Volo, Guide To Monsters decks
The rule tells us about a land type or supertype
These kind of effects usually don't see too much Standard play, but Bail Out likely would've seen at least a little had it been printed in paper, and almost certainly would've been a Commander hit
Its monocolor, instant speed, gets you back any previously-milled threat, and has some pretty significant interactions with other powerful spells including the number one self-mill effect on our list 1