Activate Zameck Guildmage's first ability by paying , causing each creature you control to enter the battlefield with an additional +1/+1 counter this turn.
Activate Ashnod's Altar by sacrificing Glen Elendra Archmage, adding CC.
Glen Elendra Archmage dies, triggering its persist ability, returning it from your graveyard to the battlefield with no -1/-1 counters due to Zameck Guildmage.