I used to run my own LGS and can assure you that dud boxes are way more common than treasure troves
That means that unless it eats removal, counters decks, infect decks, and Superfriends decks will have a 7/5 in play on turn three that can do what Atraxa does up to four times a turn cycle
Flick a Coin may be the best of these, however, since it also plays nicely with your other combo pieces
Havoc Rarity: Uncommon TYPE: Enchantment SUBTYPE: - CMC: 2 Mana cost: USD: $0.21 EUR: 0.15 TIX: 0.09 EDHREC RANK: 28742 Whenever an opponent casts a white spell, they lose 2 life
The deck accomplishes this by spamming Mesprit's Psychic Bind to deny the opponent their PokePowers
Players take turns in a clockwise order, each consisting of several phases