One’s from Shark, and the other is another Yusei Promo!

Kaiser Sea Snake had no effect in the manga but was used with a Spell to make its Level 4, its ATK halved, and make it count as 2 Xyz Material.

Junk Breaker could Tribute itself in the manga to negate monster effects on the field. (Basically a one time field wide Skill Drain at the cost of your Normal Summon)