But not higher.
Hippogryph ties as well along with Dragon Cruncher*
Marilith has a base of 23 which ties her with War* for most in the game. Winter Imp is next at 22.
Still though, Tyri? Of all the troops you would expect to have a high attack, would Tyri have ever crossed your mind?
(* = coming soon and before anything else is said, Marilith and Winter Imp have both been seen in this current version.)
Edit: According to the PC data, Hippogryph is supposed to tie but on console he's one attack weaker. Shakes head.