Add to that the coven ability to also play creatures, and we have a strong 3-mana human in Augur of Autumn
That being said, Amethyst already has good access to draw with Friends, Rabbit, Castle, and more
The effect is mandatory
Politoed Unleashed National Champs Holo CGC 10
Number 44 Language English Legal Formats Commander, Legacy, Modern, Vintage Not Legal Formats Alchemy, Brawl, Competitive Brawl, Historic, Pauper, Pioneer, Standard, Timeless Rulings (7/1/2012) Battle of Wits has an "intervening 'if' clause." This means that if you don't have 200 or more cards in your library at the beginning of your upkeep, the ability won't trigger
Renounce the Guilds $1.50 Cool spell, but I dont think there will be enough multicolored permanents running around for this edict to even been a popular sideboard choice