Nyxbloom Ancient may well be cut if I decide a card like Protean Hulk, Treeshaker Chimera, Voice of Many, or Combustible Gearhulk is better
Its access to interaction across colors, paired with flexible sacrifice effects, allows it to stabilize games and pivot into wins without relying solely on combos
Again, it is all about efficiency
If the spell is a creature, artifact, or enchantment, you put the card on the table in front of you
(i'd recommend notecards but honestly anything that fits all the text will do the trick.) BTW, if you think you have an idea for a plane that you think could be fun, feel free to make your own planeschase ideas and comment them below, because some of the cards in this planar deck were born from other people doing the same thing
If you have the city's blessing, put two +1/+1 counters on each creature you control instead