Emergent Ultimatum is perhaps a bit too open-ended in its puissance, but so was Cruel Ultimatum, and they were similarly dominant-but-defeatable in their respective Standard formats
See, Fblthp says that you can plot nonland cards from the top of your library with their plot cost being equal to their mana cost
The more card search we get in Lorcana, the more interesting deck building will become, making it easier to find specific techs when needed, and making it easier to interact with opposing strategies
This doesn't seem too powerful with cards like Sliver Hivelord, but imagine getting 3 copies of Sliver Legion, or Predatory Sliver for an insane board-wide +3/+3
Hour of Eternity: At X=2, this is a seven drop
If Melissa planeswalked to Bloomburrow, she said she'd become a squirrel, as both squirrels and her have a storied history in the game of Magic