Blue Dragon Special
Grapevine (Day) - Plant a vine by a player, uprooting any you already planted. Each night it will extend its tendrils from the previous player to the next player they visit.
Hot Potato (Day) - Toss a freshly boiled potato to someone. It will be transferred to the next player they visit.
Harvest (Passive) - Test your grapes for sweetness each night. If they are bitter than you know someone along the vine contaminated them, and must be evil.
Explode (Night) - Kill whoever is holding your potato.
grapevine allows for checking multiple players simultaneously in case any get converted, but the more players you check the harder it is to narrow down which one exactly is evil