Stag Gallant

Defiance (untap any number of creatures you control that share a color with this creature and reduce
damage dealt to this creature equal to the number of creatures untapped this way.)
Renown 2 (When this creature deals combat damage to a player, if it isn't renowned, put two +1/+1 counters on it and it becomes renowned.)
As long as Stag Gallant is renowned, all green creatures you control have hexproof.