That isn't too big of a deal if the player has good bench Pokmon to immediately come in after Kangaskhan gets knocked out, but it can leave players in an awkward position sometimes
Rankle and Torbran Every time they deal combat damage to a battle or player, you can have Rankle and Torbran make a Treasure token alongside two other choices
Luffy Leader card ties the whole deck together by allowing easy redistribution of spent resource cards back onto active attackers, keeping offensive momentum optimized
By giving them +2/+2 and lifelink and vigilance, they all become a source of fantastic life gain, to ensure you're not going to be taken out of the game quickly.
However, more experienced players understand that the specific cards milled don't matter too much
I run four copies in a Modern poison counters deck, where that extra +1/+1 really makes a difference when I attack with a Phyrexian Crusader