Catch of the Day doesn't have any of the listed keywords, triggered abilities, or power and toughness combinations if it's not on the battlefield
It adds a poker-like element and allows for card battles to end in many different ways and not just the standard win or lose
The bottom line is this: As long as life totals are going down in large chunks, it qualifies for the list
Jolrael, Mwonvuli Recluse and On the Trail need you to draw a second card which is way easier on your turn, but as you can see from my list, totally obtainable on an opponent's turn
Ajani, Nacatl Pariah A creature that becomes an MTG planeswalker, it feels a little wrong to put this Ajani on the list, since the ability to create a 3/4's worth of stats for just two mana is a significant part of the appeal here