The Nemesis Draft, as it's called, is League's first featured game mode for the year for the Summoner's Rift map. In it, each five-man team will choose one champion at a time for the opposition. Both teams will then have the opportunity to ban up to three champions.
"So ... we're excited to see how scheming and creative you guys are," reads a post from Riot's L4T3NCY. "Are we about to uncover some diamonds in the rough? Will it be, ‘Give them all melee champs' or ‘Give them all AD so we can just build armour!' And then the inevitable, ‘Ok guys. We've got four junglers and a support.. but so do they! Let's do this.' I can't wait."
So far there's no word on when Nemesis Draft will make its official debut. Polygon has reached out to Riot for more information and will update when further details are made available.