Aphelios, Faithfuls' Weapon

Nightfall (If this card was not the first you cast this turn, create Lunar Arsenal, a legendary artifact token. If Lunar Arsenal is already on the battlefield, choose a moon weapon instead.)

When Aphelios attacks, create Lunar Aresnal. When you play two unique cards for the first time each round, choose a moon weapon from Lunar Arsenal.

Level up (When you've chosen 4 or more moon weapons, give Aphelios +1/+1 and "Choose a moon weapon from Lunar Arsenal at the beginning your upkeep.")