mtg all infect cards (Blue) - Outsiders Top 10 Infect Cards in

The mill ultimate is neat but doesnt really synergize with the rest of the card, though cards like Sphinxs Tutelage and Psychic Corrosion can turn the draw from its front side (and lets be honest, youre playing blue so you will draw cards) into some library damage

That and its near one hundred dollar price tag

Anti-synergy with your own delve cards, URx Delver's burn suite, the overall prevalence of Burn, etc

On the positive note when it comes to tournaments in particular you can just focus on the game and because the various event based tournaments are not precisely linked by specific players, you can participate in these events at whatever pace you like