Casting instants is arguably the best use of prowess, as it means I can buff my prowess creatures during combat or even during my opponents turn
A pretty foil would connect with the rest of the card in the best possible way, and sometimes it does that
For one, Aboshan costs triple blue to activate
I usually get inspiration for game designing by working this schedule
Yuriko, the Tiger's Shadow 1UB Legendary Creature Human Ninja 1/3 Commander ninjutsu UB (UB, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand or the command zone tapped and attacking.) Whenever a Ninja you control deals combat damage to a player, reveal the top card of your library and put that card into your hand
Anytime you cast an expensive creature spell, you get an experience counter, and Kalemne gets stronger