Brandon

IF there does need to be a ban, and again I don't generally advocate for a ban unless I feel like the card itself is overpowered. Then I would say that it needs to be on Cauldron.

At only 2 mana, the card provides the player with three immediate effects plus a potential 4th effect:

1 - Mana fixing on creature ability activation: which is not generally that impactful but does help with the 4 effect.

2 - Repetitive, targeted graveyard removal at no additional cost: which is quiet effective alone, things like scavenger ooze (also 2 mana) at least requires additional mana each time you wanted to remove a card.

3 - +1/+1 counter generation each turn: which can have a decent impact on games especially with as many cards as we have now where counters matter.

4 - Ability to provide activated ability of removed card to multiple creatures: Even something as simple as a llanowar elf can be impactful but i have also seen things like greasewrench goblin, draconautics engineer, sunset strike master/zookeeper, keen-eyed curator, scavenger ooze, bristly bill, and demonwall and walker all have varying impact.

Not every issue in standard needs to be dealt with by banning a card.

Vivi is strong, but the deck is weaker and less bursty than izzet was before the last round of bans.

The meta in the last large tournament was also not really settled in yet and there is still deck tech going since the latest bans.

The deck can easily be knocked down a decent amount by printing a cheap removal spell that exiles and maybe reprinting something like pithing needle for cauldron.

Much rather see them add a few better control / removal cards to address the state of the meta over just banning decks.

A decent creature exile card in white would help.

Annul was a big step forward for blue to address cauldron specifically but blue could use a decent counter that either exiles a creature like dissipate or returns the creature to bottom of library or 3 cards from top or something could help.

With the return to Lorwyn around the corner I could for sure see them reprint thoughtseize, black having a 1 mana hand disruption that can both hit Vivi or cauldron can absolutely slow the deck down.

Red already has Torch and abrade which can deal with both.

Green can already out body most of the izzet deck and with things like bite down, they can typically get Vivi off the board, they also have a wide variety of artifact hate. I can easily see a good creature print bringing a green deck up the deck tier list and allowing it to compete more with Vivi.

Both Azorius and Dimir have taken large tournaments over the Vivi decks recently. Especially now that Azorius has been running Rest in Peace.