You'll be waiting until the cows come home if you leave the decision up to an inanimate piece of cardboard
I will have to try pouncer and champion of wits, given your glowing endorsement
The cards pictured above are perfect examples of utility creatures that happen to be clerics, rogues, warriors, or wizards
Also, while you can cast off the top, you are trying to cast 5+ mana cards on average
114 | Create a tapped and attacking token that's a copy of that creature, except it's not legendary and it has "At end of combat, exile this token." 1520 | Create one of those tokens
Im not certain if Curios always appear in this position or if they could be elsewhere among the Ordinary cards, but I now pay extra attention to the first card after the Unique/Elite slot