ViviVivi adds an amount of mana equal to his power, but only once on each of your turns
Maybe on its own Lightning Helix would not be enough to justify the white splash (though honestly it just might), but alongside Clever Lumimancer its a no-brainer for me
The Fire Red & Leaf Green set is pretty old at this point, but holds a special place in our hearts because of how downright good those games were
Here are some additional cards you might want to consider for your infect-themed decks that are popular across the archetype: Filigree Vector Blightsteel Colossus Tainted Strike Inkmoth Nexus Corrupted Conscience Phyresis Dreamtide Whale Whispering Specter Commanding Conclusion Skithiryx, the Blight Dragon | Illustration by Chippy Infect decks can be very powerful, but some players might argue a little too powerful in Commander
Helper cards are especially useful at Limited events, prereleases, or casual tables where someone asks, "Wait, what does this emblem/token/dungeon do again?" for the sixth time during a game