The final effect gives you the option to discard your hand and draw four cards every time the Ring tempts you, allowing you to draw a fresh set of cards if you're short, or to throw lots of creatures into your graveyard if you're leaning into Sauron's role as the Necromancer
You can evoke Vibrance for just two hybrid mana to get a quick spell-like effect, or you can hard-cast it in the late game for 5 mana to get a sturdy 4/4 body and both powerful enters-the-battlefield triggers
They didn't even give out 10-gallon cowboy hats at the Thunder Junction events, are they really going to give out a supplementary die for an ability that probably only shows up once or twice
They provide players with versatile tools for dealing with the damage and achieving victory
To top it off, both are Wizards, which enable Wizards Retorts Counterspell mode
Quality and Feel I think this is the most important thing when you're deciding whether it's worth it to order proxies or not do they feel like real Magic cards