The playmaker has produced at least 150 points in each of the previous three seasons.
Totals of 27 goals, 27 assists and 58 bonus points during that period underline his potential.
Although former club Swansea City fought a relegation battle for much of 2016/17, Sigurdsson still delivered a career-high 181 points.
The Icelander's delivery from dead-ball situations is a key weapon.
Swansea were ranked third for goals scored from set-pieces (17) in 2016/17.
The midfielder can take up a No 10 role in Everton's 4-2-3-1 set-up. He is also versatile enough to feature on the left in a 4-3-3 formation.
According to the Fixture Difficulty Rankings (FDR), each of Everton’s next four matches score at least four.
This would usually deter investment, but Sigurdsson's past record suggests he could still profit from this run.
Seven of the nine goals he scored last season were against seven of the teams that finished in the top eight.
That could decide his potential as a Fantasy option and, from Gameweek 6, when Everton’s fixtures dramatically improve, starting at home to AFC Bournemouth, Sigurdsson could become a key target.