When does the game end?

[Erik Setzer]

You can't stop a caster that doesn't want to be stopped... Aka boards edges... Stay max range to get off summons. .

But summoning spells tend to have a limited range, so they're keeping their new units held well back as well. And then you just set up a "fort" and let them come to you and grind them up and laugh maniacally.

That last part is purely optional.