Leviathan, The Second

Double Strike, Haste, Vanishing 3

Water Echo—Whenever Leviathan enters and at the beginning of each upkeep, you may tap up to two target creatures. Whenever Leviathan attacks, create a 5/1 blue Elemental creature token that is tapped and attacking. Exile this token at the end of combat.
If Leviathan, The Second would leave the battlefield or be sent to the graveyard, search your library for an Endbringer creature with a different name and exile that card face down with 3 time counters. It