[Coda]

I used Mid ninjas when I ran Draggie back in the day, but then the High evos came out, so I don't have any Mids anymore.

As for stuff that's farmable...

Evolved chimeras are also 10-cost with decent ATK; they're Attacker-type so bring in a King Flamie. Mid-evolved elemental Demons fit the niche too; they're also Attacker-type. Fully-evolved Goblins, too; ALSO attacker-type, and their leader skills are 2xATK to Attackers.

Non-uvo'ed Ogres are usable as HP sticks, but they don't have active skills.

The PADZ dragons are 10-cost, if you picked them up while the collab was up. Non-uvo'ed starters are, too, which makes de-evolving a starter for a leader a possible option.

So... if you had to farm up a whole team right this minute, I'd probably say:

Rowdy Red Samurai Goblin - King Flamie - Magma Chimera - Taur Demon - Marine Spec Ops Goblin

And then ask me so you can pair with my The Jelly's Angels.