If you've got more than five counters each turn, you could even trigger Sage of Hours multiple times to build up your +1/+1 counters even further
And the designers haven't stopped at Vivi, they've taken out Proft's Eidetic Memory and Screaming Nemesis too
Your Basic Lightning Pokmons attacks do 30 more damage to your opponents Active Pokmon (before applying Weakness and Resistance)
Defeating the Undefeatable: All of them are treated at one point or another as effectively undefeatable by their current holders (Kaiba repeatedly gloats that as long as he has Obelisk he can't lose, Marik through Strings boasts that his specifically-designed Deck makes Slifer unstoppable, and Dark Marik repeatedly shouts about how Ra cannot be beaten) against anything not another God Card, and in particular Ra is claimed to be invincible even against the other two gods
If a game of Commander lasts ten turns, and you have no way to increase your card velocity, you'll only end up seeing 17 (opening hand of seven plus drawing one card each turn) of the cards in your 99 card deck
Find out what cards you can get with your orders from the Pokmon Center UK when you ship with your forward2me address