Druid

[Head over feels]

ב"ה

I summon birds, and fast. Usually they break them out after LoS is opened up again, so not early. My brother took Alter of Skulls and killed my birds before I could take it down, but the game ended before it would've killed both of us.

What do you mean by "it would've killed both of us"?
The Altar of Skulls deal poison damage, so the necromancer is immune to this damage. Only the druid should have taken damage in upkeep phases from the altar of skulls.
The same applies for the Idol of Pestilence.

Oops, it was our first time playing the game and we didn't realize that.