If a red mana you add has certain restrictions or riders associated with it (for example, if it was produced by the last ability of Arena of Glory), they'll apply to that mana no matter when you spend it
Adrix and Nev, Twincasters Parallel Lives in the command zone, with ward to boot
Toluz was played alongside Raffine, Scheming Seer in Standard, and you can play it in discard-heavy strategies
If you can copy these creatures every turn, even at six mana, you're going to outpace your opponents and win the game
I picked the normal looking rainbow foil
Nashis just a great value creature with the stats and keywords to push through an attack