So built the strelzy (russian blackpowder unit)…
42 Attack
2.00 Attackspeed
(German) Tooltip reads:
Standing still for 5 seconds grants a stackable buf - +3 Dmg and +10% Attackspeed. Stacks up to 3 times.
Exptecd end Result:
42+(33) = 51 Attack
2.00 - 3(2*0,1) = 1.4 Attackspeed
Real results:
53 Attack
1.7 Attackspeed
Stacks go:
AD: 42 => 46 (+4) => 49 (+3) => 53 (+4)
AS: 2.00 => 1.90 => 1.80 => 1.70