two very small but striking differences
A giant threat isnt a threat at all without evasion, so lets add a couple of equipment to our deck that give trample
It can also inflict 1500 burn damage when an attack is declared involving it while it has 5 or more materials, which can synergize with the effect of "Purrely Happy Memory" that can give "Expurrely Happiness" additional attacks on monsters per battle phase, and "Purrely Delicious Memory" that can give "Expurrely Happiness" a powerful stat boost and make an opponent's monster unable to be destroyed by battle, allowing both versions of "Happiness" to attack the same monster multiple times to repeatedly trigger their effects
"Skill Drain" is also a good solution, as it simply negates their effects, which means that no card will be searched by "Kama 3" and no card will return to the hand by "Daibak" and "Kama 1"
Grading Premiums: Cards graded by PSA or BGS can trade for 2-5 times the price of raw cards
At the beginning of your end step, draw a card