Kalin Kessler has arrived in Duel Links for a limited time event. However, he is not unlockable as a playable character this time around.

What is provided is a lot of Gems in the form of a Duel-A-Thon.

As to the cards Kessler provides?

Infernity Mirage (UR)
Infernity Knight (SR)
Infernity Beetle (SR)
Infernity Inferno (SR)
Infernity Patriarch (SR)
Phantom Hand (R)
Wave-Motion Inferno (R)
Infernity Beast (R)
Madjinn Gunn (N)
Witty Phantom (N)