Companions should be played with the original ruling (as it is written on the card).
quick color pair breakdowns:
Jeskai: Cycling
Mardu: Humans
Abzan: Counters/keywords
Temur: Big Creatures
Sultai: Mutate
UG: Mutate
GB: Graveyard
UB: Flash
UR: Noncreature spells
GR: Trample
WB: Humans Midrange
GW: Vigilance/ +1/+1 counters
RW: Cycling
RB: Aristocrats/Menace
UW: Skies