It just struck something in me
The name itself, "Pokmon 151," is a nod to the original 151 Pokmon species introduced in the first-generation games, Pokmon Red and Green (Blue in the international release)
If that mana cost includes one or more colored mana symbols, the spell and the permanent it becomes are also that color or colors (see rule 105.2)
In a metagame where graveyard recursion strategies like Amber Emerald Dogs are everywhere, this is a massive advantage because it prevents the opponent from simply bringing their threat back to life the following turn
Well, I did say GBC inspired , didnt I, and honestly, this is one of the most fun hacks Ive played in ages
Oh lord, is this a dumb callback to that stupid designer search question