Thanks for your tips !
Just consider that the Esper playing in front of is move about tempo/discard than counterspells.
So this Gruul may have a chance, but deathtouch creatures and flyers are a pain.
I'm thinking about adding the 2/3 2{GR] elfe warrior that has reach (don't remember the name).
8 spells removal + trample creatures looks good enough to get rid of deathtouch creatures (x4).
Previously it was Izzet drakes vs Golgari midrange/
undergrowth, now it is Gruul midrange vs Esper midrange.
I'm sure we will have fun in this context !
The biggest issue is the manabase with only 2 rare lands ^^
(Deck constraints are 3 single mythics and 9 single rares).