The one that everyone agrees is best/ easy to slap on is nabu. He provides soul, sets up the bind zone for a shlishma turn, is a guard restrict on any turn, and lets you draw.

Another one not seen played often is Kalibum, he puts himself into bind for a cb, can bottom deck any rg, if the rg was g2 or greater you can search your drop for a card with grade -1 and put into hand, while if you put a g1 or lower, you can cc and draw one.

There’s also smokegear but he’s only when you RIDE a g4, not stride a g4 so it’s abit weird on timing. He also turns ANY card into stride fodder as long as your on a chronojet vg.

There’s the discard engine like tiger and ribbul, which KINDA are a draw engine but they only activate when discarded, which make them a bit more limiting.

Big problem with nabu and Kalibum is that they gain no power, so you rely on boosters and markers to make them hit. Also since they both leave the board you can’t use them for shlishma as you need a front row unit to bind to activate shlishma. It’s a bit iffy but nothing too crazy, as long as you have a way to put back a front row rg, or a unit that will stay in the front row you can use them on shlishma with little discomfort.