03 Galaxy Foil and 1013 Traditional Foil cards
Certainly the Onslaught cards are not deep nor do they have a high average power level but none the less the set offers some staples, some nice effects, some key cards in certain places, including some nice tribal stuff and of course great cycling things
With morph, it was easy to lose your three-mana investment to a simple Shock (Shock is reprinted in MKM, but will require three mana to kill a disguised creature)
Lorcana had a pretty rough start in terms of availability and card prices, though much of that has been hammered out over the last year or so
You can play the Emperor in aggressive or midrange decks too, enhancing your little dudes with +1/+1 counters or making more tokens
once a creature or planeswalker is in play it gets far harder for blue to deal with it, which is where the value of cards like Erode and Bitter Triumph comes from