Teleport has long been a staple summoner spell for top lane champions in League of Legends.
The one vs. one “island” nature of the lane matches perfectly with the spell, allowing players to join a team fight with just seconds of notice. In recent years though, teleport has become a common pick up in both the mid and even the bot lane on some occasions. It gives players the opportunity to split push without being punished, no matter their role. Heal, barrier, and ignite offer very little in comparison—at least for some champions.
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