An analysis of all these cards if they were in hermitcraft tcg:
Legundo common: Pretty good, decent damage and decent health, bur nothing special
TheM1G common: Bad, no health, and lackluster damage for the cost
Legundo rare: Really good card, could slow down your opponent significantly, but wouldnt be great in the late game
TheM1G rare: extremely busted, up to 140 damage every turn for just 2 items and no set up. Would be near unstoppable, still doing good damage on tails
Dr. Legundo: bad, has bad primary attack damage, which is usual for 3 cost attacks with good pay off. The pay off this is just not good, no damage and only 40hp of healing just isnt worth it
Bamboo Samurai: A little underpowered. Very similar to pearl's rare but with a drawback. No real reason to use this over Pearl
These would be some fun cards, and with some amazing art!