You can use these reserve cards to replace your active Pokmon once it is defeated, similar to how combat works in the video games
You may want to wait for a more powerful one
Crucially, as Commander Legends is relaxing the singleton rules to make drafting for it feasible, you could run multiple Mnemonic Deluges in your deck if you're lucky enough to pull them
This drop included seven mechanically unique cards (six advertised plus one bonus card), each of which was made in the likeness of the characters from the movie
Heavenly Gate of the Mikanko X SPELL Field While you control a monster that is equipped with an Equip Card, all monsters your opponent controls that can attack must attack monsters equipped with Equip Cards
Theoretically, the way these creatures are balanced is by the fact that youre supposed to sacrifice them as soon as they come into play