may i suggest a card i recently found to exist and immediately fell in love with? Faces of the Past , also i like that its cheap af. Its great in tribal, untapping and with sac engines. Imagine Marrow-Gnawer for infinite rats, or Krenko, Mob Boss with a Goblin Bombardment for infinite everything. delightful. It is a bit hard to justify it in this deck with only a goblin bombardment (as a sac engine), but it is on theme, and your tribal swarm does exist. Also, Spawning Pit exists, is on theme, and with token doublers in this deck, goes infinite with earth craft and other cool cards.

Thank you for your suggestions!

Due to the convoluted engine the deck needs to "go off" I have to carefully chose what permanents I play. I want to be as low as possible on creatures as well as non-creature permanents to make my key pieces (Engine, Ascendancy, Alarm) work. The first version of the deck actually had both Faces and the Pit in. Although they look right on point for the deck, they are not good enough unfortunately.

Faces of the Past is just too narrow. Just look at how many different types of token my spells create! Even if they ended up being all the same, I would need a sac outlet for it. Another type of card that dilutes my gameplan. When I played it, it only sat around doing nothing.

I wanted to play Spawning Pit in case of a board wipe. "Haha! Me smart! Me keep token after wipe!" Turns out, just another token spell does the same work and the deck doesn't need a sac outlet per se. Then it also isn't a spell that triggers all my untap outs. I still play Goblin Bombardment because it is just too good. I can nuke something if necessary, can retaliate in case of a wipe or can win on the spot with infinite tokens. To make the card work, I would have to heavily build around it but the deck just can't handle another setup branch.

I tried both in a slower first variant of this deck, where I have some kind of lockdown plan with Opposition , Glare of Subdual , Quest for Renewal and Seedborn Muse . I like this fast combo variant I'm playing right now way more though.

You are on the right track of what kind of cards I'm looking for. Thank you again for your contribution!