It wont take a high perception check to notice the stunning art
I think Endless One could be fine in a deck that has a focus on the +1/+1 counters on your creatures with cards like Avatar of the Resolute, but as a big payoff spell, the other options are miles better
It reads Other creatures you control with counters on them have flying and haste. Meanwhile, Sonic the Hedgehog from the recent Secret Lair drop is a 2/4 with haste and Gotta Go Fast
Compare it to a typical Izzet ability like Spellheart Chimera: See how they only pump up with instants and sorceries

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6) Aura of Need This is my default name for a global enchantment, especially if it's white