Etherlords and its sequel. The actual gameplay is pretty much MTG and the character I picked rode around the over world on a giant spider. You can pick them up on GOG for pocket change but are probably on Steam too

D2R as necromancer?

Masters of Anima was a really fun minion summoning game. It is very similar to overlord style of game play if I recall correctly.

Story was generic but I love the game itself.

Pillars of Eternity’s Chanter is all about summoning, with the sequel adding more options there as well. You have many different types of Summons, and on the side you also juggle some active spells and buffs as ‘Chanter’ in this universe is kinda like a ‘Bard’: their songs and poems is how they summon things.

Torchlight 2, as either an Engineer with mechanical minions or an Outlander with shadowlings.

Obviously different ARPGs like Diablo 2 . Necromancer can have a lot of skellies boning around

Me furiously taking notes.

But yeah, sadly some of my best minion moments have been online-centric games. Some tabletops give that feel, like MtG and some DnD classes if you really tweak your character. My summoner bard was fun, even if it added to already slow games. And remember, summons don’t just have to be for combat. I once used Earth Elementals for evidence collection.

This is a pretty common feature of traditional roguelikes. Try Dungeon Crawl Stone Soup.

Sacrifice, if you don’t mind how early-3D-era it is

There needs to be a distinction between a summoner with like 5 strong minions and a summoner with a trash mob of 30+ cannon fodder.

I have literally the perfect game for you. It’s called Boneraiser Minions! It’s indie pixel art but it is super fun!