Delve is used to great effect on a few cards, but more ways to cast huge spells for less while still triggering the higher cost for Rootha is an easy upgrade
And the last two sets released truly are the epitome of this, with a clearly unpolished and perhaps straight-up bad set ( Spider-Man ) leading to a vibrant and exciting product filled with new and interesting mechanics ( Avatar )
Arguably the best 4-ink character, The Matchmaker Unforgiving Expert destroys a lore for every challenge she makes, not every banish
Doomwake Giant makes it impossible for your opponent to keep tokens or small-value creatures in play, but you get enough constellation triggers that this can become a full board wipe
For example, Charizard is known as a Fire Type Pokemon, but Delta Species Charizard is Dark Type
While the card predates the mythic rarity, every printing it has seen since the rarity's introduction has been as a mythic