Blink Tiger

Avoidance. If the displacer beast is subjected to an effect that allows it to make a saving throw to take only half damage, it instead takes no damage if it succeeds on the saving throw, and only half damage if it fails.

Displacement. The blink tiger projects a magical illusion that makes it appear to be standing near its actual location, causing attack rolls against it to have disadvantage. If it is hit by an attack, this trait is disrupted until the end of its next turn. This trait is also disrupted while the displacer beast is incapacitated or has a speed of 0.

Multiattack. The displacer beast makes two attacks with its claws

Claw. Melee Weapon Attack: +6 to hit, reach 10 ft., one target. Hit: 7 (2d6 + 4) bludgeoning damage plus 3 (2d6) piercing damage.

Existential Tear.  Melee Attack: [rollable]+6;The blink tiger pounces on its prey.  The target must make a DC 15 STR saving throw, or be brought into the pocket dimensions the tiger uses to teleport. They take 4d8 damage + 2, and have disadvantage on spell casting or attack rolls even if the displacement feature is disrupted. 

Blink.  As a bonus action, the blink tiger can step into the ethereal plane. On any subsequent bonus action, it may blink back into the material plane as far as it's movement speed.