Hey! minecrafters on the PC, i have a command to try out, it replaces the block your standing on. just a heads up
/setblock ~ ~ ~ mob_spawner 0 replace {SpawnData:{id:wither_skeleton,HandItems:[{Count:1,id:bow,tag:{ench:[{id:34,lvl:3},{id:48,lvl:5},{id:49,lvl:2},{id:50,lvl:1},{id:51,lvl:1},{id:70,lvl:1},{id:71,lvl:1}]}},{Count:1,id:shield,tag:{ench:[{id:34,lvl:3},{id:70,lvl:1},{id:71,lvl:1}]}}],ArmorItems:[{Count:1,id:golden_boots},{Count:1,id:golden_leggings},{Count:1,id:golden_chestplate},{Count:1,id:golden_helmet}],CustomName:Gold Wither,HandDropChances:[0.3f,0.3f],ArmorDropChances:[1.0f,1.0f,1.0f,1.0f],ActiveEffects:[{Id:1,Amplifier:0,Duration:999999},{Id:3,Amplifier:0,Duration:999999},{Id:5,Amplifier:0,Duration:999999},{Id:10,Amplifier:1,Duration:999999}]},SpawnRange:20,SpawnCount:2,Delay:2,MinSpawnDelay:2,MaxSpawnDelay:60,RequiredPlayerRange:5,MaxNearbyEntities:6}
ENJOY. TELL ME HOW IT IS.