This is exactly the kind of moment Skolnik meant when he talked about emotional resonance not spoiling the scene, but letting the mechanics make you remember it
Whenever you draw this red creature later in the game, look to use it to one-shot a player if you can
Host creatures all have enters-the-battlefield effects, and their art and name are divided by a vertical line
It becomes far more engaging when you read the rest of the ability and hit that alternative win condition
For example, if you've spent three mana on spells so far this turn and you control a permanent with an ability that triggers "whenever you expend 4," that ability will trigger the next time you spend at least one mana to cast a spell this turn
I tried not to put any cards over 5$ into it, although there are a couple like Cyclonic Rift and Gilded Lotus that are just too good to miss out on